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) of the Viet Minh, who were threatening the bishopric of Bui Chu, in Nam Định province. Defeated, the Việt Minh split in small groups, disguised themselves with peasant clothes and escaped to the south.
