World War I: During the Battle of Sarikamish, Ottoman forces mistook one another for Russian troops. The following friendly fire incident leaves 2,000 Ottomans dead and many more wounded.

The Battle of Sarikamish was an engagement between the Russian and Ottoman Empires during World War I. It took place from 22 December 1914, to 17 January 1915, as part of the Caucasus campaign.