It is called a 'broadside' when all the guns from fore to aft of a warship are fired simultaneously in one direction.
Broadside, as a noun, was used as a naval term to mean either all the guns on one side of a warship, or the nearly simultaneous firing of all of these guns (as a naval combat manoever).
Broadside the simultaneous firing of all the armament on one side of a warship
Broadside were a feature of 17th and 18 century naval battles. This was when all cannon on one side of the ship were fired at once.
Naval Battle of the Tejo happened in 1384-07.
The BATTLE OF JUTLAND was the largest naval battle in World War I.
Naval Battle of Kaliakra happened on 1912-11-21.
Naval Battle of Hakodate happened on 1869-05-10.
Naval Battle of Guadalcanal happened on 1942-11-15.
Naval Battle of Campeche happened on 1843-05-16.
Naval Battle of Casablanca happened on 1942-11-16.
Sea Battle, Naval Engagement, Naval battle, Naval Action, Sea Fight, Sea Engagement, Surface Engagement, Surface Action, to name a few.
The opposite of broadside is narrowside.