The fall and dissolution of the Holy Roman Empire was accelerated by French intervention in the Empire in September 1805. On 20 October 1805, an Austrian army led by General Karl Mack von Leiberich was defeated by French armies near the town of Ulm. The French victory resulted in the capture of 20,000 Austrian soldiers and many cannons. Napoleon's army won another victory at Austerlitz on 2 December 1805. Francis was forced into negotiations with the French from 4 to 6 December 1805, which concluded with an armistice on 6 December 1805.