The tube in these images is retracted into the traveling position, or “out of battery” to balance the load. When the weapon was to be emplaced, a catch was tripped and the recoil system returned the tube to the “in-battery” position. The large square block on top of the breech is a counterbalance weight. The limber is in the motorized configuration. The short tongue and lunette were exchanged for a long tongue when horse traction was used.
155mm Howitzer, Model of 1918 (Schneider): The 155mm Howitzer, Model of 1918 (Schneider) was the American manufactured version of the French piece. Its shield is straight in profile and mounted at a slant.
155mm Howitzer Caisson, Model of 1918: The 155mm Howitzer Caisson, Model of 1918 carried 14 projectiles and 16 propellant charges for the 155mm Howitzer, M1916 or 1917 (Schneider). For horse traction one caisson had attached a long tongue to hitch the horses, or for mechanical traction two short-tongued caissons were hitched together. Note in the upper right background of the lower photograph the limbers used to pull the 155mm Howitzer, M1917 (French) or 1918(American made) (Schneider).