Final answer:
The Viet Minh used guerrilla warfare, home advantage, and underground tunnels as war techniques in the First Indochina War.
Step-by-step explanation:
The Viet Minh, a Vietnamese independence movement, employed a variety of war techniques during the First Indochina War. They utilized guerrilla warfare, which involved hit-and-run tactics, ambushes, and sabotage, to target French colonial forces. The Viet Minh also made use of home advantage by utilizing their knowledge of the terrain and the support of the local population. Additionally, they established underground tunnels and supply routes to evade detection and maintain a steady supply of resources.