Patrol, Mine Warfare and Coastal Craft

Small and medium vessels that guard coasts, rivers and harbours rather than fight in a battle fleet: patrol vessels of navies and coast guards, minesweepers and minelayers that clear or lay mines, and armoured boats that patrolled rivers. An entry belongs here when the cited article calls the vessel, or its class, a patrol vessel, patrol boat, minesweeper, minelayer, gunboat or armoured river boat. It excludes destroyers and corvettes built for fleet escort, submarines, and the supply and survey ships that serve a fleet. Entries are placed by what their own cited article says, so each one sits in the narrowest group its source supports, and the group page lists it beside the other members.