On Jun. 24, 1954, G.M. 100 received orders to abandon its defensive positions at An Khê and fall back to Pleiku, some away over Route Coloniale 19. At the road marker 'Kilometer 15' the column was ambushed by Việt Minh troops belonging to the 803rd Regiment and suffered heavy losses. The remains of G.M. 100 managed to break through the ambush. The remnants of G.M. 100, now with G.M. 42 and the 1st Airborne Group had to brave more of enemy road and was ambushed on June 28 and 29 at Dak Ya-Ayun by the Việt Minh 108th Regiment. The survivors finally reached Pleiku the following day.