Guerilla warfare is a form of irregular warfare that involves small groups using tactics like ambushes, sabotage, and hit-and-run attacks against larger traditional military forces. This strategy is often employed by groups that lack the resources or manpower to engage in conventional battles, allowing them to exploit their knowledge of the terrain and the element of surprise. Typically, guerilla fighters operate in familiar environments, such as forests or urban areas, making it difficult for conventional armies to track and engage them. This type of warfare has been used throughout history, notably in conflicts involving Vietnamese forces during the Vietnam War and Spanish partisans during the Peninsular War.