The Judgment then turns to Bosnia and deals with the rise of ethnically-constituted parties in 1990 and the efforts of the Serb Democratic Party (SDS) to achieve a Greater Serbia by annexing parts of Bosnia and Croatia where there were Serb populations.97 There is a thorough discussion of how the Yugoslav National Army (JNA), which up to that point had been multi-ethnic, became 90 percent Serb. In 1991 it had become an army without a state to defend, and thus turned into an instrument of a militaristic Serb nationalism.98 War raged between the newly independent Croatia and Serb forces in late 1991, and this greatly increased tensions in Bosnia. The JNA withdrew from Croatia in early 1992 and brought 100,000 troops, airplanes, helicopters, and heavy weapons into Bosnia which further exacerbated anxiety and hostility among the population.99