The Battle of Deligrad in December 1806 provided a decisive victory for the Serbs and bolstered the morale of the outnumbered rebels. To avoid total defeat, Ibrahim Pasha negotiated a six-week truce with Karađorđe. By 1807 the demands for self-government within the Ottoman Empire evolved into a war for independence backed by the military support of the Russian Empire. Combining patriarchal peasant democracy with modern national goals, the Serbian revolution was attracting thousands of volunteers among Serbs from across the Balkans and Central Europe. The Serbian Revolution ultimately became a symbol of the nation-building process in the Balkans, provoking unrest among the Christians in both Greece and Bulgaria. Following a successful siege with 25,000 men in late 1806, on 8 January 1807 Karađorđe proclaimed Belgrade the capital of Serbia after the remaining fortifications surrounded on St Stephen's day.