In a significant engagement during the First Indochina War, the Viet Minh, specifically the 803rd Regiment, executed a well-planned ambush against the French G.M. 100 unit at Mang Yang Pass, located near An Khê. The operation was characterized by its strategic timing and execution, reflecting the Viet Minh's effectiveness in guerrilla warfare. The French forces were likely unprepared for a well-coordinated attack in this mountainous terrain, which provided the Viet Minh with advantageous positions for their assault.

The ambush resulted in heavy casualties for the French troops, further depleting their resources and weakening their overall military presence in the region. The Viet Minh's tactical advantages, coupled with their understanding of local geography and community support, were critical elements in their operational success. French forces, engaged in maintaining control over vast territories in Vietnam, faced ongoing logistical challenges and increasing resistance from the Viet Minh, who were becoming more organized and determined.

This engagement at Mang Yang Pass was emblematic of the broader struggle during the First Indochina War, highlighting the effectiveness of the Viet Minh's strategies and the vulnerability of colonial military powers in local conflicts. Such operations contributed to the eventual unraveling of French colonial rule in Vietnam, setting the stage for a significant shift in the region's political landscape.