|Origin & Designer||[@designer]|
|Crew||6 (Commander, Gunner, Two Loaders, Radio Operator & Driver)|
|Main Armament||1 x 155mm L/36 M1917A1, M1918M1 or M1919 Gun|
|Elevation||-5° to +30°|
|Turret Traverse||14° Left & Right (Manual)|
|Secondary Armament||1 x .50 cal M2HB Heavy Machine Gun (AA Mount)|
|Ammunition Carried||10 x 155mm & 1000 x .50 cal|
|Combat Weight||27.000 kg|
|Armour||Upper Hull Front: 25mm.|
Lower Hull Front: 51mm.
Upper Hull Sides: 10mm.
Lower Hull Sides: 19mm.
Hull Rear: 19mm.
Hull Top: 25mm.
Hull Bottom: 13mm.
Open Gun Compartment.
|Engine||Continental R975 C1 (Petrol)|
|Transmission||5 Forward & 1 Reverse|
|Maximum Road Range||139 miles (225 km)|
|Maximum Cross Country Range||87 miles (140 km)|
|Maximum Water Range||[@maximum_water_range]|
|Maximum Road Speed||21 mph (34 kph)|
|Maximum Cross Country Speed||12 mph (19 kph)|
|Maximum Water Speed||[@maximum_water_speed]|
|Notes||The M12 was built on the M3 tank chassis and mounted either the M1917, M1917A1 or M1918M1 gun in an open compartment. It was initially developed as a training vehicle and hundred were built in 1942 with some used for training and others placed in storage. Just before the allies landed in France, 74 M12s were dusted off and taken to Europe, these saw action during operation Cobra and later used in the direct fire mode against enemy strong points. Due to the lack of space the M12 could only carry 10 rounds, so the M30 Ammunition carrier was developed, this was basically a M12 without the gun and could carry a full gun crew plus 40 rounds of ammo. After World War Two the M12 was withdrawn from service and replaced by the M40 GMC.|