R boat

A total of 424 boats were built for the Kriegsmarine before and during World War II. The German Navy used them in every theatre including the Baltic, Mediterranean and the Black Sea. In addition to its designed use as minesweepers, these boats were used for convoy escort, coastal patrol, minelaying and air-sea rescue.

About 140 R boats survived the war and these were distributed amongst the Allies. Some were used by the German Mine Sweeping Administration (GMSA) to clear western Europe of naval mines. Twenty-four boats were transferred back to the post-war German Navy, the Bundesmarine, in 1956 and were used until the late 1960s. An unusual feature of these ships is the use of Voith Schneider Propellers on approximately one quarter of the boats for extra maneuverability.

Additionally, dozens of captured vessels from France, United Kingdom, the Netherlands and Italy were used as foreign R-boats (R-boote Ausland) and were designated with RA-, RH- and RD- prefixes. A further 8 coastal motor fishing boats were designated as auxiliary R-boats and named R111-R118 in the 11th R-boat flotilla.

In the inter-war years and during the Second World War, a total of twenty Räumboots-Flottille (German for "Minesweeper Flotillas") were created. While most were dissolved late in the war or after the German surrender, a few were kept for use by the German Mine Sweeping Administration (GMSA) and dissolved post-war. An additional flotilla was created in the immediate post-war, also for use by the GMSA.[5]

• Schnellboot, known to the Allies as E-Boats
• Motor Launch for the British equivalents
• M-class minesweeper (Germany) for larger German World War 2 minesweepers
• Sperrbrecher for another type of German World War 2 minesweeper

• Erich Gröner; Dieter Jung; Martin Maass (November 1991). German Warships, 1815–1945: U-Boats and Mine Warfare Vessels (rev. ed.). Naval Inst Press. ISBN 978-1-55750-301-5.