What type of warfare emphasizes the use of small, mobile groups of troops?

Guerrilla warfare is characterized by the use of small, mobile groups of troops to conduct irregular and unconventional military operations. This type of warfare often takes place in a variety of environments, allowing these small units to exploit their mobility and knowledge of the terrain. Guerrilla tactics may include ambushes, sabotage, and hit-and-run attacks, which are designed to disrupt and harass a larger, more conventional military force.

While asymmetric warfare also involves elements of unconventional tactics and may feature smaller forces against a larger enemy, it is broader in scope. Asymmetric warfare encompasses not just guerrilla tactics but also cyber warfare, terrorism, and other non-traditional methods utilized by weaker opponents to counter stronger adversaries.

Conventional warfare focuses on large, organized military forces engaging in set-piece battles, while warfare of attrition aims to weaken the opponent through sustained losses. Neither of these aligns with the emphasis on small, agile groups seen in guerrilla warfare. The distinction makes guerrilla warfare the most accurate answer in the context of the question.