The Mark VII appears across many contemporary British battleship, battlecruiser, and cruiser classes because it was a dependable quick-firing weapon. Its 31-pound shell was light enough for crews to sustain roughly six to eight rounds per minute. A maximum range of about 11,600 yards let the gun threaten lightly built attackers before many contemporary 21-inch torpedoes reached their most effective launch positions. That comparison explains why a ten-gun battery suited a ship screening a battle line from destroyers.
Chapter · 16:13-19:37
The 4-inch Mark VII as a counter-destroyer weapon
Ten quick-firing 4-inch Mark VII guns gave the class reliable firepower at ranges useful against contemporary torpedo attacks.