Field gun
Since the start of World War II, the term field gun has been used for long-range artillery pieces that fire at a relatively low angle, as opposed to howitzers which can fire at higher angles. By the end of World War II most artillery in use were howitzers of 105 mm to 155 mm. The only common field guns still used were the British 5.5 inch and the US 155 mm Long Tom. The Long Tom had been developed from a French World War I weapon.