World War I: During the <a href="https://en.wikipedia.org/wiki/Battle_of_Sarikamish" id="mwfA" rel="mw:WikiLink" title="Battle of Sarikamish">Battle of Sarikamish</a>, Ottoman forces mistook one another for Russian troops. The following friendly fire incident leaves 2,000 Ottomans dead and many more wounded.<sup about="#mwt27" class="mw-ref reference" data-mw='{"name":"ref","attrs":{"name":"Olcen"},"body":{"id":"mw-reference-text-cite_note-Olcen-4"}}' id="cite_ref-Olcen_4-0" rel="dc:references" typeof="mw:Extension/ref"><a href="./December_23#cite_note-Olcen-4" id="mwfQ" style="counter-reset: mw-Ref 4;"><span class="mw-reflink-text" id="mwfg">[4]</span></a></sup>