"Operation Battering Ram" . "3 divisions" . . "(16,000 infantry)" . "2,313" . . "1917-04-15" . . . . . "4 divisions" . . . . . "Indecisive" . . . . . "United Kingdom" . "German attack on Lagnicourt" . . . . . "German attack on Lagnicourt" . . . . . . "(4,000 infantry)" .