On March 17, 1945, Captain Cortadellas's Gaur K is dropped at Dien Bien Phu (area of the famous siege in the Indochina War (1946–1954)). At French Commander Marcel Alessandri's request, Gaur K, supported by 80 remaining legionnaires from the 3/5th REI ("Régiment Étranger d'Infanterie"), was sent to the "arrière-garde" of the Alessandri column retreating to China for hundreds kilometers of tracks in the high region. Battles ensued on April 11 at Houei Houn, April 15 at Muong Koua, April 21 at Boun Tai and April 22 at Muong Yo.