. ▁In ▁ 1 9 2 5 ▁ 5 5 th ▁( K ent ) ▁Anti - A ircraft ▁Brigade , ▁RA ▁was ▁formed ▁to ▁defend ▁the ▁Med way ▁Town s ▁of ▁north ▁Kent . ▁ 2 8 th ▁Air ▁Def ence ▁Brigade ▁( AD ▁B de ) ▁was ▁then ▁formed ▁at ▁Tun bridge ▁Well s ▁to ▁command ▁the ▁AA ▁def ences ▁in ▁the ▁area , ▁even ▁though ▁it ▁only ▁had ▁ 5 5 th ▁AA ▁B de ▁under ▁its ▁command , ▁and ▁that ▁in ▁turn ▁consisted ▁only ▁of ▁ 1 6 3 rd ▁( K ent ) ▁AA ▁B atter y ▁at ▁Tun bridge ▁Well s . ▁There ▁were ▁also ▁ 3 1 3 ▁and ▁ 3 1 4 ▁independent ▁AA ▁search light ▁companies ▁of ▁the ▁RE ▁( TA ) ▁in ▁Kent , ▁but ▁these ▁were ▁not ▁formally ▁sub ordin ated ▁to ▁ 2 8 ▁AD ▁B de ▁at ▁this ▁time . ▁ ▁At ▁first , ▁ 2 8 th ▁AD ▁B de ▁was ▁sub ordinate ▁to ▁the ▁Home ▁Count ies ▁Area ▁of ▁Eastern ▁Command , ▁but ▁as ▁Britain ' s ▁AA ▁def ences ▁expanded ▁during ▁the ▁ 1 9 3 0 s , ▁higher ▁form ations ▁became ▁necessary . ▁ 1 st ▁AA ▁Division ▁was ▁formed ▁to ▁cover ▁London ▁and ▁the ▁Home ▁Count ies ▁on ▁ 1 5 ▁December ▁ 1 9 3 5 . ▁The ▁ 2 8 th ▁A DB ▁was ▁re organ ised ▁as ▁ 2 8 th ▁( Th ames ▁& ▁Med way ) ▁Anti - A