Guerrilla warfare was the war technique used by the smaller and weaker groups. Vietcong was the military group that was involved in guerilla warfare in Vietnam.
Vietcong was the war group that revolted against American armed forces in South Vietnam. They were the group consisting of the communist members supported by the government of North Vietnam.
These groups employed the warfare tactic and raided the soldiers. They were hard to be identified by the US and the army of South Vietnam as they were dressed like normal citizens.
Therefore, Vietcong was the group that used the guerilla warfare tactic.
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