World War I: The <a href="https://en.wikipedia.org/wiki/12th_Army_(German_Empire)" id="mwlg" rel="mw:WikiLink" title="12th Army (German Empire)">German 12th Army</a> occupies <a href="https://en.wikipedia.org/wiki/Warsaw" id="mwlw" rel="mw:WikiLink" title="Warsaw">Warsaw</a> during the <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Gorlice–Tarnów_Offensive" id="mwmA" rel="mw:WikiLink" title="Gorlice–Tarnów Offensive">Gorlice–Tarnów Offensive</a> and the <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Great_Retreat_(Russian)" id="mwmQ" rel="mw:WikiLink" title="Great Retreat (Russian)">Great Retreat of 1915</a>.