American M7 Howitzer Motor Carriage

Left front view of M7 Howitzer Motor Carriage, "Finalist."

The 105 mm Howitzer Motor Carriage M7 was an American self-propelled artillery vehicle produced during World War II. It was given the official service name 105 mm Self Propelled Gun, Priest by the British Army, due to the pulpit-like machine gun ring, and following on from the Bishop and the contemporary Deacon self-propelled guns.

Witnessing the events of the war, U.S. Army observers realized that they would need a self-propelled artillery vehicle with sufficient firepower to support armored operations. Lessons learned with half-tracks (such as the T19 HMC - 105mm Howitzer on M3 Half-track chassis) also showed that this vehicle would have to be armored and fully tracked. It was decided to use the M3 Lee chassis as the basis for this new vehicle design, which was designated T32.

The pilot vehicles used the M3 chassis with an open-topped superstructure, mounting an M1A2 105 mm howitzer and, following trials, adding a machine gun, the T32 was accepted for service as the M7 in February 1942 and production began that April. Before production had begun, the British Tank Mission had requested 2,500 to be delivered by the end of 1942 and a further 3,000 by the end of 1943, an order which was never fully completed.

As the M4 Sherman tank replaced the M3, it was decided to continue production using the M4 chassis (the M4 chassis was a development of the M3). The M7 was subsequently supplanted by the M37 HMC (on the "Light Combat Team" chassis that also gave the M24 Chaffee light tank). While the first M7s were produced for the U.S. Army, some were diverted to support the British in North Africa. Ninety M7s were sent to the British Eighth Army in North Africa, who were also the first to use it in battle during the Second Battle of El Alamein as well as their own Bishop, a self-propelled gun based on the 87.6 mm caliber Ordnance QF 25-pounder gun-howitzer.

The British did find problems with the M7 though, as the primary armament was of U.S., not British, standard. This meant that the M7s had to be supplied separately, causing logistical complications. It was a problem that was only truly resolved in 1943 on arrival of the 25-pounder-armed Sexton developed by the Canadians on a M3 chassis. Until that time though, the British continued to use the M7 throughout the North African Campaign and the Italian Campaign. The three assault infantry divisions (3rd and 50th British, 3rd Canadian) that landed on Sword, Juno and Gold beaches on D-Day during the Normandy Invasion had their artillery regiments equipped with the M7; these were replaced by the standard towed 25-pounder guns of the infantry in early August. It was also used in Burma and played a significant part in the Battle of Meiktila and the advance on Rangoon in 1945. After the Sexton appeared, most British M7s were converted into "Kangaroo" armored personnel carriers.

In U.S. service, the M7 was a great success. During the Battle of the Bulge, each U.S. armored division had three battalions of M7s, giving them unparalleled mobile artillery support.

A total of 3,490 M7s—4,267 if including the M7B2—were built and they proved to be reliable weapons, continuing to see service in the U.S. and allied armies well past World War II.

Type: Self-propelled artillery

Place of origin: United States

Used by:

U.S. Army

Argentine army

Belgian army

British Army

Canadian Army

Israel Defense Forces

Norwegian army

Pakistan Army

Philippine Army

Philippine Constabulary

Taiwanese Army

Manufacturer:

American Locomotive Company (M7)

Pressed Steel Car (M7B1)

Federal Machine and Welder (M7)

Produced: April 1942–July 1945

Number built:

M7: 3489

M7B1: 826

M7B2: 127 converted from M7B1

Weight: 50,640 lb (22.97 metric tons)

Length: 19 ft 9 in (6.02 m)

Width: 9 ft 5 in (2.87 m) with sandshields

Height: 8 ft 4 in (2.54 m); 9 ft 8 in (2.95 m) over AA machine gun

Crew: 8

Armor: 12–62 mm

Main armament: 105 mm M1/M2 Howitzer; 69 rounds

Secondary armament: 1 x 0.5 in (12.7 mm) M2 Browning machine gun; 300 rounds

Engine: Continental R-975 C1/C4; Ford GAA (M7B1); 400 or 340 hp (298 or 254 kW)

Suspension: Vertical volute spring

Operational range: 120 mi (193 km)

Speed: 24 mph (39 km/h) on road; 15 mph (24 km/h) off road

Variants

M7: The first M7s produced were modified M3 Lee medium tanks. In order to maintain a low silhouette, the howitzer elevation had to be restricted to 35°. In May 1942, after only a month of production, the vehicle was altered to increase its ammunition storage from 24 to 69 rounds. This was achieved by placing seven rounds on the left wall, five on the right, and storing the remainder under floor plates. The M7 also went through a fairly rapid shift from being based on the M3, to having more commonality with the M4 Sherman. The first major example was an adoption of the M4's three-piece housing, single-piece casting and suspension. In British service, some M7s carried a radio set, which took the place of 24 rounds of ammunition.

M7B1: Completing the shift, the M7B1 was fully based on the M4A3 Sherman chassis. It was standardized in September 1943, and declared substitute standard in January 1945.

M7B2: During the Korean War, the limited elevation of the howitzer became noticeably problematic and it was increased to 65° to increase the effective range of the howitzer. The machine gun mount also had to be raised to give a 360° firing arc.

Defrocked Priest: As one part of the Allied effort to capture Falaise and break out from the Normandy beachhead, a total of 72 M7s had their main guns removed in the field for service as armored personnel carriers and were first used in Operation Totalize. These field modified vehicles were referred to as "Defrocked Priests," "Unfrocked Priests" or as "Holy Rollers." The work was done in one week by 250 personnel from 14 British and Canadian Royal Electrical and Mechanical Engineer units. 36 vehicles each were allocated to the 4th Infantry Brigade of the 2nd Canadian Division and the 154th (Highland) Brigade of the 51st (Highland) Division, which led the attack.

Kangaroo: A Canadian armored personnel carrier conversion of the M7 for use by British and Commonwealth units in northern Europe. The Kangaroo could carry 20 infantry plus a crew of two. A total of 102 were converted between October 1944 and April 1945. The name "Kangaroo" became generic for all conversions of armored fighting vehicles into personnel carriers, including Ram tank conversions.

 

M7 Howitzer Motor Carriage.

M7 Howitzer Motor Carriage, Philippines.

M7 Howitzer Motor Carriage firing.

M7 Howitzer Motor Carriage firing.

M7 Howitzer Motor Carriage M7 loading onto an M19 Tank Transporter for transport from the Mannheim area, Germany, 14 May 1945.

Right side view of M7 Howitzer Motor Carriage, "Finalist."

Rear upper view of M7 Howitzer Motor Carriage, "Finalist."

Left front view of M7 Howitzer Motor Carriage, "Finalist."

M7 Howitzer Motor Carriage during training with a jeep alongside and an artillery observation plane overhead.

M7 Howitzer Motor Carriages in action during training. Note the ammunition trailers being towed by the vehicles.

M7 Howitzer Motor Carriage, Okinawa.

M7 Howitzer Motor Carriage moving toward the front lines near Kasserine.

M7 Howitzer Motor Carriage on railroad flatcar ready for shipment.

105mm Howitzer Motor Carriage, Battery C, 274th Field Artillery Battalion, fires a mission on 1 January near Bastogne.

Loading a 105mm shell into the howitzer of a "Priest" (M7 Howitzer Motor Carriage).

105mm Howitzer Motor Carriage M7 of an American armored unit on the alert near Bastogne. By 27 December more than thirty-five corps artillery battalions were firing approximately 19,000 rounds of ammunition daily in support of the Third Army. By the end of the year that army was supported by over 1,000 guns of 105mm caliber or larger. Christmas night the Third Army's artillery began using the new proximity fuse, which proved particularly effective in interdicting road junctions and harassing enemy positions.

105mm M7 Howitzer Motor Carriage crosses a ponton bridge in Italy.

M7 Howitzer Motor Carriage, Battle of the Bulge.

M7B1 Howitzer Motor Carriage, 12th vehicle, Company C, 423rd or 420th Armored Artillery Battalion, 10th Armored Division, supporting 101st Airborne Division, Bastogne, late 1944.

105mm M7 Howitzer Motor Carriages of the 30th Infantry Division in action near La Gleize, Belgium.

M7 Howitzer Motor Carriage, Company C, 276th Field Artillery Battalion, 6th Armored Division, Third Army, Brulange, France, November 1944.

Overhead view of an M7 105mm Howitzer Motor Carriage. This is an earlier model of the "Priest" but the basic layout was similar for all models.

M7 Howitzer Motor Carriage.

M7 Howitzer Motor Carriage crossing temporary bridge, Remiremont, France, September 1944.

M7 Howitzer Motor Carriage with L-3 observation plane overhead.

M7 Howitzer Motor Carriage.

M7B2 Howitzer Motor Carriage of a Marine unit on the Tientsin-Peiping highway, China, 1946. Carries the name "Millie" on the machine gun pulpit.

M7 Howitzer Motor Carriage in the Ardennes, in front of the Siegfried Line, 1945.

M7B2 Howitzer Motor Carriage.

M7B2 Howitzer Motor Carriage.

M7B2 Howitzer Motor Carriage.

M7B2 Howitzer Motor Carriage.

M7B2 Howitzer Motor Carriage.

Deck lashing of M7 Howitzer Motor Carriage, side lashing, turnbuckle attached to wire and to pad eye welded on deck. Fore and aft lashing, turnbuckle attached to towing cleft or hanger, and to pad eye on deck, SS John Calhoun (HR 119), Newport News, Virginia, 1 March 1943.

Fore and aft lashing of M7 Howitzer Motor Carriage, showing turnbuckle fastened to towing clevis of hanger, and by swivel to pad eye welded to deck, SS John Calhoun (HR 119). 1 March 1943.

Deck lashing of M7 Howitzer Motor Carriage, side lashing, 7/8-inch chain attached to turnbuckle which is attached by swivel to welded pad eye on deck, SS John Calhoun (HR 119), Newport News, Virginia, 1 March 1943.

Deck lashing of M7 Howitzer Motor Carriage on SS John Calhoun (HR 119), showing wire attached to body of vehicle about to be fastened by turnbuckle and shackle to pad eye on deck. 1 March 1943.

Deck lashing of M7 Howitzer Motor Carriage, side lashing, turnbuckle fastened by wire to body of vehicle, and by swivel to pad eye welded on deck. Note 12 x 12 cradle of timber. SS John Calhoun (HR 119), 1 March 1943.

M7 Howitzer Motor Carriage.

T32 105mm Howitzer Motor Carriage prototype.

M7 105 mm HMC. Note exposed ammo, protected by fold down armor on later vehicles.

M7 HMC inflatable rubber decoy.

105mm Howitzer Motor Carriage M7 "Priest."

M7 Howitzer Motor Carriage.

M7 Howitzer Motor Carriage.

M7 HMC with fold down armor and sunken pulpit in use by Canadians, probably in Italy.

American soldiers in M7 Priest enter Cebu City, Philippines.

M7 105mm Howitzer Motor Carriage being tested for desert warfare at Iron Mountains, California. It carries both a 105mm Howitzer and a .50 caliber machine gun. Lieutenant M. Hutchison of Enterprise, Alabama, is at the extreme right. Corporal L. Roberts from Graham, Texas, is at post behind the howitzer. Corporal Downing, whose home is Dekalb, Missouri, is in the turret.

Another view of the same M7 105mm Howitzer Motor Carriage as in the above photo.

M7 105mm Howitzer Motor Carriages roll down the production lines of the American Locomotive Company in Schenectady, New York.

M7 Howitzer Motor Carriage.

 

Battle of Walcheren Causeway: Operation Vitality

Royal Hamilton Light Infantry carriers move through the Dutch village of Krabbendijke on the Beveland Causeway, 27 October 1944. (Libarary and Archives Canada)

The Battle of Walcheren Causeway (Operation Vitality) was an engagement of the Battle of the Scheldt between the 5th Canadian Infantry Brigade, elements of the British 52nd (Lowland) Infantry Division and troops of the German 15th Army in 1944. It was the first of many conflicts on and around Walcheren Island during the Scheldt battles. It was also the second major battle fought over a terrain feature known as the Sloedam during the Second World War.

Background

After the breakout from Normandy by the Allied armies, beginning August 13, 1944, the German forces held on stubbornly to the French and Belgian English Channel ports. This forced the Allies to bring all supplies for their rapidly advancing armies from the artificial harbor they had constructed off the beaches of Normandy, and from Cherbourg. Because of its port capacity Antwerp became the immediate objective of the British 21st Army Group commanded by Field Marshal Bernard Montgomery. While Antwerp fell to Montgomery on September 4 no supplies could be landed there until the German forces holding the lower reaches of the Scheldt, between Antwerp and the North Sea, were removed.

Tactical Importance

A feature known as the Sloe Channel separated the island of Walcheren from the South Beveland isthmus. A narrow causeway connected the two, known to the Dutch as the Sloedam (it literally dammed the Sloe Channel) and in English as the Walcheren Causeway. The causeway carried a rail line from the mainland onto the island and to the port of Vlissingen (or Flushing, as it was known in English). A paved road also ran the length of the causeway, which was about 40 meters (130 ft) wide and a kilometer (0.6 mile) long. On either side of this causeway, which was elevated only a few meters (feet) above sea level, marsh, mud-flats and deep water all hindered movement between Walcheren and South Beveland.

Prelude

As the Allies had to secure a port of the capacity of Antwerp before they could contemplate the invasion of Germany itself, the Battle of the Scheldt involved bitter fighting.

By 31 October 1944, all land surrounding the Scheldt estuary had been cleared of German control except for Walcheren Island, from where coastal batteries commanded the approaches to the waterway. These guns prevented the Allies from making use of the port facilities of Antwerp to alleviate their logistical concerns.

The island's dykes had been breached by attacks from RAF Bomber Command: on 3 October at Westkapelle, with severe loss of civilian life; on 7 October at two places, west and east of Vlissingen; and on 11 October at Veere. This flooded the central part of the island, forcing the German defenders onto the high ground around the outside and in the towns.

The 2nd Canadian Infantry Division had marched west down the South Beveland isthmus and by 31 October had cleared all German opposition from South Beveland. Walcheren Island was connected to South Beveland by a narrow causeway, 40 meters wide and 1600 meters long.

Plans to employ assault boats over the Sloe Channel were thwarted by muddy conditions unsuitable for water craft. The Calgary Highlanders had been selected for this amphibious operation, as they had received stormboat training in the UK in anticipation of an opposed water crossing of the Seine River, which invasion planners had predicted would be necessary approximately 90 days after the landings in Normandy. In the event, the ground was too boggy to employ the boats, and the Highlanders were utilized as conventional infantry in a landward attack directly over the causeway.

Battle

"C" Company of The Black Watch (Royal Highland Regiment) of Canada took heavy casualties on the afternoon and evening of 31 October 1944 in an attempt to "bounce" the Causeway.[2][page needed] During their attack, the existence of a deep crater on the causeway was discovered; this crater had been blown by German engineers as an anti-tank obstacle. It was later utilized by the Canadians as a company command post during the battle as it developed.

"B" Company of The Calgary Highlanders were ordered forward just before midnight and were similarly stopped halfway down the causeway.

A new fireplan was drawn up and Major Bruce McKenzie's "D" Company inched forward under intensive gunfire, reaching the west end, and securing it, at dawn on 1 November.

German counterattacks were heavy and prolonged, and included the use of flame weapons on the Canadians. At one point, all Calgary Highlander officers in one company were wounded or killed, and the brigade major, George Hees took command of a company.

Company Sergeant Major "Blackie" Laloge of the Calgary Highlanders was awarded the Distinguished Conduct Medal for his actions at Walcheren Causeway, at one point throwing back German hand grenades before they could explode among his men.

Two platoons of Le Régiment de Maisonneuve took over the bridgehead on Walcheren Island on 2 November, but were forced back onto the Causeway. A battalion of Glasgow Highlanders were ordered to pass through, but they also were unable to expand the bridgehead on the island.

Aftermath

Landings by British Commandos of the 4th Commando Brigade eventually sealed the fate of the German defenders on Walcheren Island, attacking from seaward at Flushing and Westkapelle. The battle for the causeway itself had been a costly, and ultimately unnecessary, diversion.

The 2nd Canadian Infantry Division went into reserve in the first week of November, moving into the Nijmegen Salient for the winter. The Calgary Highlanders suffered 64 casualties in the 3 days of fighting at Walcheren Causeway. Le Régiment de Maisonneuve had one man killed and 10 wounded. The Black Watch suffered 85 casualties in the period 14 October to 1 November 1944, the bulk of them suffered on the causeway.

Legacy

The Battle of Walcheren Causeway is commemorated annually by The Calgary Highlanders and Regimental Pipes and Drums with a parade and church service on the Wednesday night or weekend closest to the anniversary of the battle. Representatives and members of the local Dutch community in Calgary are usually invited to attend the service. The battle was selected from among the Regiment's 20 Second World War battle honors as being most representative of the spirit of determination displayed by the unit's forerunners, the 10th Battalion, CEF, whose counterattack at St. Julien during the Second Battle of Ypres is also commemorated annually by the Regiment.

A permanent monument was erected at the causeway and dedicated in the 1980s. The causeway itself no longer exists as such; land on both sides of the former railway embankment has been reclaimed and the Sloe Channel is now farmland. Remnants of German concrete fortifications still exist both on Walcheren Island and South Beveland.

In the 21st century, the monuments were moved due to rail and road construction. A large monument dedicated to the French troops that fought a battle there in May 1940 predominates, overlooking memorials to both the 52nd (Lowland) Division and the 5th Canadian Infantry Brigade who fought there in the autumn of 1944.

The assault on Walcheren Causeway is depicted in the 2020 Dutch film The Forgotten Battle.

Other Battles

g had occurred in the vicinity of the causeway and Arnemuiden in May 1940 during the German invasion of the Netherlands.

Bibliography

Copp, Terry, The Brigade.

Further Reading

Brooks, Richard (21 June 2011). Walcheren 1944 : storming Hitler's island fortress. Botley, Oxford: Osprey Pub. Co.

The Walcheren Causeway 31 October-2 November 1944.

The Capture of Walcheren, 1-8 November 1944. 


Aerial photograph taken shortly after the daylight attack on the sea-wall at Westkapelle, Walcheren (the Netherlands), showing a breach in the wall at the most westerly tip of the island. The Allies decided that the dykes had to be breached before the Allied assault in order to flood the inland areas and restrict movement by the German defenders. On 3 October 1944, 252 Avro Lancasters and seven De Havilland Mosquitoes of the RAF Bomber Command attacked the sea wall and dykes at Westkapelle, Flushing and Veere. (Imperial War Museum C 4668)

The bombing of Walcheren in October, by RAF Bomber Command, had breached the dykes around the island turning it into a massive lagoon, rimmed by long stretches of intact dykes. German gun emplacements on the unaffected areas virtually provided a continuous fortification bristling with guns of every caliber. Imperial War Museum)

Westkapelle landing plan beaches. No 48 (RM) Commando, under Lt-Colonel J L Moulton DSO, would come ashore south of the gap. From there, they would advance on Zoutelande, two miles to the south.

No 47 (RM) Commando, under Lt-Colonel CF Phillips DSO, would land behind No 48 and to meet up with No 4 Commando near Flushing.



British assault troops landed on Walcheren at dawn on 1 November 1944 and most of Flushing was included in the first bridgehead. The landings were supported by fire from British warships. The object of the assault is to silence the enemy guns menacing the Scheldt passage to the port of Antwerp. This image shows troops advancing along the waterfront near Flushing with shells bursting ahead. (Imperial War Museum BU 1255)

The Battle for Walcheren Island: An aerial photograph of bombs exploding on the Walcheren dyke, Holland during RAF Bomber Command's raid on the island, 1944. (Imperial War Museum C 4669)

Landing craft tanks carrying Royal Marine Commandos on way to beach during the landing by Royal Marine commandos on the island of Walcheren at Westkapelle, the most western point of the island, during the final phase of the battle to free the Belgian port of Antwerp. In the foreground is landing craft tank LCT 979 followed by LCT 980 further LCTs are behind whilst another long line of LSTs can be seen in the background. (Imperial War Museum A 26274)



The Nolle Dyke gap during Operation Infatuate.

Captain W.A. Teed (foreground) of the North Shore Regiment, Embarkation Staff Officer of the 8th Canadian Infantry Brigade, talking with Captain C.J. Aendry, commanding officer of an Alligator amphibious vehicle, near Terneuzen, Netherlands, October 13, 1944.


Landing craft and vehicles of the Canadian First Army engaged in clearing the Scheldt estuary near Antwerp.

Amphibians (Buffalos) coming ashore at Westkapelle.

As they continue to battle German troops for control of the Scheldt Estuary, Canadian soldiers traverse a flooded area in an amphibious vehicle.


In the Breskens Pocket across the West Scheldt from Walcheren Island, German soldiers man a machine gun position that is partially camouflaged with tree branches.

Canadian soldiers of the Calgary Highlanders march past a German Sturmgeschütz assault gun that has been knocked out during earlier fighting. This photo was taken in South Beveland during the advance against stubborn German resistance on Walcheren Island in October 1944.

Personnel of the Toronto Scottish Regiment (M.G.) aboard a motorboat en route from Beveland to North Beveland, Netherlands, November 1, 1944.

Sherman and Stuart tanks, Priest and assorted other vehicles of the 5th Canadian Armoured Division.

As the sound of sniper fire rings out, Scottish soldiers of the 52nd Lowland Division crouch behind a piece of heavy equipment in Flushing on Walcheren Island.

As the hard-fought campaign to clear the Scheldt Estuary of German resistance draws to a close, British commandos round up surrendering enemy soldiers in Westkapelle.

Lt.General Wilhelm Daser, Commander of the 70th Infantry Division and Fortress Commander of Walcheren, led into captivity accompanied by Major Hugh Johnston of the Royal Scots.

Lieutenant Colonel Mike Vernon, CD, Commanding Officer of The Calgary Highlanders, ponders the monument to the 5th Canadian Infantry Brigade erected at the site of the Walcheren Island Causeway, in memory of the sacrifice of the three Canadian regiments, as well as soldiers of the 52nd (Lowland) Division of the British Army who fought a pitched battle there beginning on Hallowe'en night 1944. The Calgary Highlanders sent a contingent to visit European battlefields in June 2010 to mark the centennial year of the regiment. In the background, the Regimental Pipes and Drums play at the site of monuments erected to the memory of Allied soldiers who fell fighting the Germans in the vicinity during the invasion of 1940. (Michael Dorosh)