ircraft ▁Group , ▁based ▁at ▁K itch ener ▁Bar ra cks , ▁Ch ath am , ▁and ▁command ing ▁all ▁the ▁gun ▁and ▁search light ▁units ▁in ▁the ▁area . ▁ ▁Order ▁of ▁Battle ▁ 1 9 3 5 ▁The ▁composition ▁of ▁ 2 8 ▁AA ▁Group ▁in ▁December ▁ 1 9 3 5 ▁was ▁as ▁follows : ▁▁ 5 5 th ▁( K ent ) ▁Anti - A ircraft ▁Brigade , ▁RA ▁( TA ) ▁ ▁H Q ▁at ▁Fort ▁Clar ence , ▁Ro chester ▁▁ 1 6 3 rd ▁( K ent ) ▁Anti - A ircraft ▁B atter y ▁at ▁Tun bridge ▁Well s ▁▁ 1 6 6 th ▁( City ▁of ▁Ro chester ) ▁Anti - A ircraft ▁B atter y ▁at ▁Fort ▁Clar ence , ▁Ro chester ▁▁ 2 0 5 th ▁( Ch ath am ▁and ▁Fa ver sh am ) ▁Anti - A ircraft ▁B atter y ▁at ▁Ch ath am ▁ 5 8 th ▁( K ent ) ▁Anti - A ircraft ▁Brigade . ▁A ▁RA ▁( TA ) ▁H AA ▁gun ▁unit ▁formed ▁in ▁ 1 9 3 5 ▁by ▁conversion ▁of ▁ 5 2 nd ▁( K ent ) ▁Med ium ▁Brigade , ▁Royal ▁Art illery ▁ ▁H Q ▁at ▁Er ith ▁▁ 2 0 6 th ▁( Er ith ) ▁Anti - A ircraft ▁B atter y ▁at ▁Er ith ▁▁ 2 0 7 th ▁( Er ith ) ▁Anti - A ircraft ▁B atter y ▁at ▁Er ith ▁▁ 2 0