Guerrilla warfare
Guerrilla is a term invented in Spain during the liberation war agains France. It means "little war".
It is based in small, mobile and flexible combat groups called cells, without a front line. Guerrilla tactics are based on ambush and sabotage, and their ultimate objective is usually to destabilize the government through long, low intensity confrontation.
Guerrillas usually control rural areas with lots of places to hyde, as forests and mountains.
The Vietnam War is commonly thought of as a guerilla war in the United States. However this is incorrect. Although the Vietcong used guerilla
tactics in the early phases of the war, by 1965 when American
involvement escalated, the Vietcong had largely been replaced
by regular units of the North Vietnamese Army, who were using
largely conventional tactics in their engagements with American troops and the Army of the Republic of Vietnam.