The Hà My Massacre was a massacre Killing purportedly conducted Action by the South Korean Marines on 25 February 1968 of unarmed citizens in Hà My village , Dien Duong commune , Điện Bàn District Quảng Nam Province in South Vietnam .

This combination Cause_to_amalgamate proved fatal for the bases ' defenses , culminating Self_motion in a decisive French defeat Conquering at the Battle of Dien Bien Phu .

From then on , the French focused Aiming on creating Creating strong fortified positions , against which Viet Minh General Giáp could pit his forces , culminating in Operation Castor and the Battle of Dien Bien Phu .

Meanwhile , the remaining Australian forces in Phuoc Tuy Province also successfully repelled Defending repeated Viet Cong attacks Attack against Ba Ria and Long Dien , as part of the Tet Offensive that had engulfed population centres across South Vietnam .