Board Thread:Event Community Discussion/@comment-25730832-20170511175819/@comment-1637496-20170513023506

Tsubakura wrote: A correction, kaibokan were multipurpose ships, since the beginning they were supposed to be used as fisheries patrols in peacetime, minesweepers and escorts in wartime. Japan didn't place any emphasis whatsoever on escorts, they didn't even consider to convoy their merchant traffic, hence they didn't specifically build ships for this purpose.
 * The Kaiboukan were built with the purpose of settling fishing disputes between USSR and Japan, not for use as an escort in war.

On this note the British sloops were similar, originally they were colonial gunboats in peacetime and minesweepers/escorts in wartime. The "patrol frigates" of the River class for all intent and purpose were austere and cheaper versions of the sloops (refer to Friedman's British Destroyers & Frigates: The Second World War & After for the relation between them).