te ▁and ▁the ▁Sie ge ▁of ▁Tob ru k . ▁On ▁ 2 4 ▁November ▁ 1 9 4 0 , ▁ 7 5 th ▁H AA ▁Regiment ▁was ▁transferred ▁to ▁ 6 2 ▁AA ▁B de ▁to ▁defend ▁the ▁North ▁Mid lands , ▁but ▁ 2 8 ▁AA ▁B de ▁was ▁strength ened ▁by ▁ 9 0 th ▁H AA ▁and ▁ 4 th ▁L AA ▁reg iments : ▁▁ 9 0 th ▁H AA ▁Regiment , ▁RA ▁( TA ). ▁H AA ▁Regiment ▁raised ▁at ▁South gate , ▁London ▁in ▁April ▁ 1 9 3 9 . ▁▁ 2 7 2 , ▁ 2 8 4 , ▁ 2 8 5 ▁B atter ies ▁ ▁In ▁February ▁ 1 9 4 1 , ▁ 5 3 ▁( City ▁of ▁London ) ▁H AA ▁Regiment ▁moved ▁to ▁Cro yd on ▁and ▁was ▁transferred ▁to ▁the ▁command ▁of ▁ 4 8 ▁AA ▁B de . ▁ ▁Mid - W ar ▁During ▁ 1 9 4 2 ▁more ▁of ▁the ▁brig ade ' s ▁experienced ▁units ▁were ▁transferred ▁to ▁War ▁Office ▁( W O ) ▁control , ▁trained ▁and ▁equ ipped ▁for ▁mobile ▁war fare , ▁and ▁then ▁sent ▁to ▁active ▁the at res ▁over se as , ▁particularly ▁for ▁Operation ▁Tor ch ▁in ▁North ▁Africa . ▁Sometimes ▁they ▁returned ▁tempor arily ▁to ▁AA ▁Command ▁while ▁await ing ▁emb ark ation . ▁In cre asing ly , ▁the ▁replacement ▁H AA ▁and ▁support ▁units ▁were ▁" M ixed ", ▁indicating ▁that ▁the ▁oper ational