The Mortier de 150 mm T Modèle 1917 Fabry was the standard French heavy trench mortar of World War I. It remained in service through 1940, with some 1,159 available during the Phony War. The tube was supported by two recoil-recuperators in a flask-rocker assembly that was mounted on a platform with six fixed spades. The finned mortar "bomb" was loaded from the muzzle, but the propellant was loaded from the breech and ignited by a percussion ignition system.

Mortier de 150 mm T Modèle 1917 Fabry
A Fabry Trench Mortar at the U.S. Army Field Artillery Museum, Ft. Sill, OK
Type	Heavy trench mortar
Place of origin	France
Service history
In service	August 1918 - 1940
Used by	France United States
Wars	World War I World War II
Production history
No. built	1,159+
Specifications
Mass	615 kg (1,353 lbs)
Barrel length	2100 mm
Diameter	150 mm
Calibre	150 mm
Breech	muzzle-loading
Recoil	recoil-recuperators in a flask rocker assembly
Carriage	firing platform
Elevation	45° - 72°
Traverse	27°
Rate of fire	2-4 rpm
Muzzle velocity	156 m/s
Maximum firing range	2,000 m (2,167 yards)

For transport it was broken down into three loads, each towed on machine gun carts by either one horse or eight men. Each cart also carried twenty 17-kilogram (37 lb) bombs.