Answer: Germany
Notes: Germany's private army was "Freikorps". Freikorps were irregular German and other European military volunteer units, or paramilitary, that existed from the 18th to the early 20th centuries. They effectively fought as mercenary or private armies, regardless of their own nationality. In German-speaking countries, the first so-called Freikorps were formed in the 18th century from native volunteers, enemy renegades, and deserters. In the aftermath of World War I and during the German Revolution of 1918–19, Freikorps consisting largely of World War I veterans were raised as right-wing paramilitary militias. They were ostensibly mustered to fight on behalf of the government against the Soviet-backed German Communists attempting to overthrow the Weimar Republic. But, the Freikorps largely despised the Republic and were involved in assassinations of its supporters.
