After more than one year using improvised trench artillery weapons, most of the time dangerous and not so efficient, the '2-inches Medium Trench Mortar' designed by the Royal Ordnance Factories at Woolwich inspired by a pre-war Krupp design appeared on the frontline from the end of 1915. Manufactured by numerous contractors, this weapon threw a football-size sperical projectile weighing 39 to 43 lbs, filled in with explosive (amatol or ammonal), smoke making material, or more rarely toxic gasses (chlorine and phosgen), and equipped with a long tubular tail. The characteristic shape of this projectile gave way to this weapon nicknames : 'Toffee apple', 'Tadpole' or 'Plum pudding' !

The mortar itself was simply made of a 2-in inner diameter steel tube in which the projectile tail was introduced after a propulsive charge corresponding to the desired range, and equipped at its lower end with a Lee-Enfield rifle mechanism triggering a blank cartridge. The tube was linked to a wooden platform via a ball hinge, and its elevation could be tuned by turning a small wheel commanding a screw integrated inside a leg connected to the tube at one third height.

This weapon was intensively used particularly on the Somme and on the Yser in 1916, often in a barbed wires net destruction mission. Its relative lack of precision, too short range, revelating fire noise and flash, and its low efficiency projectile (not to forget the very unpopular trend of the tail to be projected backwards to the friendly trenches at explosion...) induced its progressive replacement from 1917 by the 6-in Medium Mortar Newton.

Main characteristics :

• Weight in firing position : 105 lbs (48 kg)
• Calibre : 2 in (50.8 mm)
• Tube length : 40.85 in (1038 mm)
• Projectile weight : 51 lbs (25 kg)
• Initial velocity : unknown
• Maximum range : 100 à 570 yards (100 - 570 m)
• Direction range : unknown
• Elevation range : unknown