Battle of Kostiuchnówka
...that the Battle of Kostiuchnówka during the Brusilov Offensive in summer 1916 is considered the largest and most vicious of the battles involving the Polish Legions?
...that the <b id="mwFZE"><a href="./Battle_of_Kostiuchnówka" id="mwFZI" rel="mw:WikiLink" title="Battle of Kostiuchnówka">Battle of Kostiuchnówka</a></b> during the <a class="mw-redirect" href="./Brusilov_Offensive" id="mwFZM" rel="mw:WikiLink" title="Brusilov Offensive">Brusilov Offensive</a> in summer 1916 is considered the largest and most vicious of the battles involving the <a href="./Polish_Legions_in_World_War_I" id="mwFZQ" rel="mw:WikiLink" title="Polish Legions in World War I">Polish Legions</a>?