March 2001- The Nazi invasion of Yugoslavia in April 1941, resulted in the replacement of a unified state by a puppet regime in Serbia and an ideologically-fascist Independent State of Croatia under the Ustasa regime. This regime claimed for Croatia most of the ethnically mixed Bosnia-Herzegovina as well as the Serb-dominated eastern Slavonia and Krajina. To cleanse those areas of ethnic Serbs, the Ustasa committed atrocities, the brutality of which was most potently symbolized by the death camp at Jasenovac, later to also become symbol for Yugoslavia's 1990s disintegration. Until recently, however, most historical inquiry into World War II Yugoslavia has focused on the civil war between Tito's communist Partisans and Draza Mihailovic's Serb-dominated Cetniks. The royal government-in-exile, based in London, appointed Mihailovic war minister in January 1942, and considered the Cetniks its representative in Yugoslavia. A historical issue that has not been sufficiently examined is the British relationship with the government-in exile during the war and how that relationship prompted the British to lead the Allies into switching support from Mihailovic to Tito.