Battle of Frankfurt an der Oder
... that after the Battle of Frankfurt an der Oder in 1631, it took six days to bury the dead in mass graves?
... that after the <b id="mwYw"><a href="./Battle_of_Frankfurt_an_der_Oder" id="mwZA" rel="mw:WikiLink" title="Battle of Frankfurt an der Oder">Battle of Frankfurt an der Oder</a></b> in 1631, it took six days to bury the dead in <a href="./Mass_grave" id="mwZQ" rel="mw:WikiLink" title="Mass grave">mass graves</a>?