main battery

A main battery is the primary weapon or group of weapons around which a warship is designed. As such, a main battery was historically a gun or group of guns, as in the broadsides of cannon on a ship of the line. Later, this came to be turreted groups of similar large-caliber naval rifles.

e.g.: FIRE ALL MAIN BATTERY TURRETS!, LOAD ALL MAIN BATTERY TURRETS WITH AP ROUNDS!