Operation Bretagne was a French Union military operation between 1 December 1952 and 4 January 1953, during the First Indochina War. Four Mobile Groups (Groupes Mobiles, GM) and General de Berchoux's two Amphibian Sub-Groups hunted and engaged the 9th Regiment (304th Division) and the 48th Regiment (320th Division) who were threatening the bishopric of . Defeated, the Việt Minh split in small groups, disguised themselves with peasant clothes and escaped to the south.