Topic summary
Irregulars
Extracted from the Wikipedia article Irregular military.
Other instances of irregulars
Use of large irregular forces featured heavily in wars such as the Three Kingdoms period, the American Revolution, the Irish War of Independence and Irish Civil War, the Franco-Prussian War, the Russian Civil War, the Second Boer War, Liberation war of Bangladesh, Vietnam War, the Syrian Civil War and especially the Eastern Front of World War II where hundreds of thousands of partisans fought on both sides.