The Hotchkiss 25 mm Anti-Tank Gun came into service with the French Army in 1934. When the British Expeditionary Force went to France in 1939 they had insufficient anti-tank weapons. They were issued with 300 Hotchkiss guns which the all mechanised British Army soon found was not robust enough to be towed behind a vehicle. They had been issued with the horse drawn version of the gun. The gun was used in Portée (carried on the back of a truck) and is believed to be the first gun to be used in that manner.
In British service the gun was known officially as Anti-Tank Gun, 25 mm Hotchkiss, Mark I on 25 mm Carriage, Mark I.
Data
| Length of Barrel | 71 inches (1.8 metre) – 72 calibres |
| Length with carriage | 11.35 feet (3.46 metres) |
| Height | 3.54 feet (1.08 metres) |
| Width | 3.7 feet (1.13 metres |
| Crew | 4 |
| Elevation | -5° to +21° |
| Traverse | 60° |
| Maximum range | 3,300 feet (1,000 metres) |
| Effective range | 2,624 feet (800 metres) |