The article reveals the specifics of the tactical actions of guerrilla-insurgent formations in military conflicts following World War II (1945–1989). Specifically, it examines the tactics of guerrilla actions in Palestine (1945–1948), during the Chinese Civil War (1946–1949), in the Korean War (1950–1953), the struggle of the National Liberation Front of Algeria against French colonizers (1954–1962), the Vietnamese insurgents against French colonial and American forces (1946–1975), the guerrilla and underground struggle in African countries in the 1950s–1970s, and highlights the tactics of the Afghan armed opposition against Soviet troops in 1979–1989. Furthermore, it is established that the Korean War served as the starting point for the creation of specialized anti-guerrilla units, enriched global experience in guerrilla warfare, and the use of special-purpose forces. Conclusions are drawn regarding the commonalities in the actions of guerrilla-insurgent forces in post-war conflicts, their tactics are clarified, and their strengths and weaknesses are identified.