A large-caliber gun integrated into a military ship and mounted with the turret and the weapons system of an armored howitzer. Disposed below the turret body portion is a shell magazine in which is installed a shell transporter that grasps the shells and supplies them to a shell-raising mechanism, by means of which the shells are conveyed from the shell magazine into the turret body portion. A shell transfer arm, pivotably mounted on the trunnion of the weapon, carries at one end a charger that in the raised position of the shell transfer arm is aligned with the gun bore axis of the weapon, and in the lowered position is aligned with the direction of movement of the shell-raising mechanism. The shells are introduced from the shell-raising mechanism directly into the charger and after pivoting-up of the shell transferring arm are supplied to the weapon.