Final answer:
Guerrilla fighters are small bands of fighters who use hit-and-run tactics in guerrilla warfare.
Step-by-step explanation:
The small bands of fighters who use hit-and-run tactics are called guerrilla fighters. Guerrilla warfare is a type of unconventional warfare where a smaller group uses ambushes, sabotage, and other surprise tactics to harass and weaken a larger, more conventional military force. The Vietcong during the Vietnam War is a well-known example of a guerrilla group.