3-inch Gun M5

3 inch Gun M5 was an anti-tank gun developed in the United States during World War II. The gun combined a 3-inch (76.2 mm) barrel of the anti-aircraft gun T9 and elements of the 105 mm howitzer M2. The M5 was issued exclusively to the US Army tank destroyer battalions starting in 1943. It saw combat in the Italian Campaign and in the Northwest Europe campaign.

While the M5 outperformed earlier anti-tank guns in the US service, its effective employment was hindered by its heavy weight and ammunition-related issues. Losses suffered by towed TD battalions in the Battle of the Bulge and the existence of more mobile, better protected alternatives in the form of self-propelled tank destroyers led to gradual removal of the M5 from front line service in 1945.

Country Name Origin Year
United States of America 1942
Country Name Operational Year Retirement Year
United States of America 1943 View

In 1940, the US Army just started to receive its first antitank gun, the 37 mm Gun M3. While it fitted the request of the Infantry for light, easy to manhandle anti-tank weapon, Artillery and Ordnance foresaw a need for a more powerful gun. This led to a number of expedient designs, such as adaptations of the 75 mm M1897 or towed variants of the 75 mm M3.

Late in 1940 the Ordnance Corps started another project - an anti-tank gun based on the 3 inch anti-aircraft gun T9. The barrel of the T9 was combined with breech, recoil system and carriage, all adapted from the 105 mm howitzer M2. The pilot of the weapon, named 3 inch Gun T10, was ready by September 1941. Although the subsequent testing revealed minor problems, it was clear that the gun, eventually standardized as M5 on carriage M1, presented major performance improvement over existing designs.

Production began in December 1942. In November 1943 a slightly modified carriage was standardized as M6. In this carriage a flat shield borrowed from the 105 mm howitzer was replaced by a new sloped one. In January 1944 AGF requested to upgrade the guns built with the early carriage M1 to carriage M6; consequently most of the guns that reached the frontline had the M6 carriage.

In October 1943 the first towed battalion - the 805th TD - arrived in Italy. Subsequently the M5 saw combat in the Italian Campaign and in the Northwest Europe. One of the most notable engagements came during the German counterattack on Mortain in August 1944. The 823rd TD, attached to the 30th Infantry Division, played a key role in the successful defence of Saint Barthelemy, destroying fourteen tanks and a number of other vehicles, though at the price of losing eleven of its guns.

In addition to the anti-tank role, the gun was often used to supplement divisional field artillery or to provide direct fire against enemy fortifications (e.g. a combat report from the 614th TD mentioned a two-gun section firing 143 shells at an enemy post, achieving 139 hits)

Although the M5 easily outperformed older anti-tank guns in the US service, it was large and heavy - making it hard to manhandle into position - and its anti-armor characteristics were found to be somewhat disappointing. In part that reputation reflected initial problems with fuses of APCBC/HE shells. The 3 inch APHE round which was based on the naval 3 inch round, had a small charge in the rear of the round which was supposed to explode after penetration of the targeted tank's armor plating. Unfortunately it was discovered that it exploded on impact or shortly after causing the round not to penetrate. It is still a puzzling mystery as to why this problem was never addressed with a better base fuze or even removing the small HE charge in the rear of the round. This was also the problem with the M10 tank destroyer.

APDS round was never developed for the M5; an APCR round existed (see ammunition table below), but it is not clear if it was ever issued to towed TD battalions.

As a result of the aforementioned shortcomings, commanders and troops generally preferred an alternative in form of self-propelled tank destroyers, which offered better mobility and also better protection for their crews.

The greatest test of the TD battalions and their M5 guns came during the Battle of the Bulge. In this battle, towed tank destroyers fought much less successfully and suffered much higher losses than the self-propelled ones. A report from the aforementioned 823rd battalion said that "tank destroyer guns were one by one flanked by enemy tanks and personnel driven from guns by small arms and machine guns fire". Taking the recent combat experience into account, on 11 January 1945 the War Department confirmed a request to convert the towed TD battalions to the self-propelled form. This decision meant gradual removal of the M5 from frontline service, a process that continued until the end of the war in Europe.

Today, the M5 is utilized by the US Army for ceremonial purposes. The Presidential Salute Guns Platoon of The Old Guard currently maintains a battery of ten M5's at Fort Myer for service mainly in the National Capital Region.

Type Anti-tank gun
Place of origin United States
Service history
In service 1943-
Used by US Army
Wars World War II
Production history
Produced 1942-1944
Number built 2500
Specifications
Weight combat: 2,210 kg
(4,872 lbs)
Length 7.1 m (23 ft 4 in)
Barrel length bore: 50 calibers
Width 2.2 m (7 ft 3 in)
Height 1.62 m (5 ft 4 in)
Shell 76.2x585 mm. R
Caliber 3-inch (76.2 mm)
Breech horizontal block
Recoil hydropneumatic
Carriage split trail
Elevation -5° to +30°
Traverse 45°
Rate of fire 12 rounds per minute
Muzzle velocity 792 m/s (2,600 ft/s) with AP/APCBC rounds
Maximum firing range 14.7 km (9.13 mi)

End notes