numerous Polish formations
... that numerous Polish formations fought in Russia from the First World War, through the Russian Revolution of 1917 up to the Polish–Soviet War?
... that <b id="mwC2s"><a href="./Polish_Armed_Forces_in_the_East_(1914–1920)" id="mwC2w" rel="mw:WikiLink" title="Polish Armed Forces in the East (1914–1920)">numerous Polish formations</a></b> fought in Russia from the <a href="./World_War_I" id="mwC20" rel="mw:WikiLink" title="World War I">First World War</a>, through the <a class="mw-redirect" href="./Russian_Revolution_of_1917" id="mwC24" rel="mw:WikiLink" title="Russian Revolution of 1917">Russian Revolution of 1917</a> up to the <a href="./Polish–Soviet_War" id="mwC28" rel="mw:WikiLink" title="Polish–Soviet War">Polish–Soviet War</a>?