 Complete the following phrase:  Although 2nd London Division suffered few casualties at Aubers Ridge, its gunners had learned a sobering lesson about the impossibility of suppressing strong defences with inadequate guns and shells. On 11 May the division was redesignated a href47th202812nd20London2920Division47th 12nd London Divisiona, and on the night of 1415 May it took its place in the line for the 