Polish 4th Rifle Division
...that the Polish 4th Rifle Division was the only Polish military unit that fought in the Russian Civil War and returned to Poland undefeated?
...that the <b id="mwA7Q"><a class="mw-redirect" href="./Polish_4th_Rifle_Division" id="mwA7U" rel="mw:WikiLink" title="Polish 4th Rifle Division">Polish 4th Rifle Division</a></b> was the only <a href="./Poland" id="mwA7Y" rel="mw:WikiLink" title="Poland">Polish</a> <a class="mw-redirect" href="./Military_unit" id="mwA7c" rel="mw:WikiLink" title="Military unit">military unit</a> that fought in the <a href="./Russian_Civil_War" id="mwA7g" rel="mw:WikiLink" title="Russian Civil War">Russian Civil War</a> and returned to Poland undefeated?