The high number of casualties incurred in the Battle of Vukovar caused serious popular discontent in Serbia and Montenegro, where tens of thousands of those receiving draft papers went into hiding or left the country. A near-mutiny broke out in some reservist units, and mass demonstrations against the war were held in the Serbian towns of Valjevo, Čačak and Kragujevac. In one famous incident, a tank driver named Vladimir Živković drove his tank all the way from the front line at Vukovar to the federal parliament in Belgrade. Many Serbs did not identify with the Croatian Serb cause and were unwilling to see their lives, or those of their children, sacrificed at Vukovar.