In 1918, after four years of slaughter, deprivation and hardship, the Central Powers of Austro-Hungary and Germany were rocked by strikes and mutinies. In February, a naval mutiny broke out at Kotor and sailors shot their officers; by October, the Austro-Hungarian army had collapsed from mass desertions and political upheaval. Soon afterwards a mutiny by German sailors at Kiel merged with other uprisings and quickly escalated into a full-scale rebellion against the imperial state, sparking the abdication of the German Kaiser and the proclamation of a workers’ republic on 9 November 1918.