▁forth coming ▁invasion ▁of ▁Norm andy ▁( Operation ▁Over l ord ). 2 ▁AA ▁Group ▁War ▁Di ary , ▁January – J une ▁ 1 9 4 2 , ▁The ▁National ▁Archives ▁( T NA ), ▁K ew , ▁file ▁W O ▁ 1 6 6 / 1 4 6 2 1 . ▁ ▁Short ly ▁after ▁D - Day , ▁the ▁anticip ated ▁attacks ▁by ▁V - 1 ▁flying ▁bomb s ▁( c oden amed ▁' D ivers ') ▁began , ▁and ▁the ▁AA ▁def ences ▁had ▁to ▁be ▁res h uff led ▁once ▁more : ▁guns ▁were ▁moved ▁from ▁the ▁London ▁I A Z ▁and ▁elsewhere ▁to ▁the ▁South ▁Coast ▁to ▁try ▁to ▁destroy ▁the ▁V - 1 s ▁as ▁they ▁came ▁in land ▁( Operation ▁D iver ). ▁Within ▁ 2 4 ▁jours ▁of ▁the ▁start ▁of ▁Operation ▁D iver , ▁ 2 ▁AA ▁Group ▁had ▁placed ▁four ▁rows ▁of ▁eight - gun ▁H AA ▁positions ▁in ▁a ▁bel t ▁ 1 2 , 0 0 0 ▁yards ▁deep ▁just ▁in ▁front ▁of ▁the ▁North ▁Down s , ▁extending ▁from ▁East ▁Gr inst ead ▁to ▁Ch ath am , ▁back ed ▁by ▁light ▁AA ▁( LA A ) ▁guns ▁and ▁rad ar - control led ▁search light s . ▁The ▁bel t ▁was ▁divided ▁into ▁for ▁se ctors , ▁each ▁with ▁a ▁G OR . ▁After ▁a ▁fort night , ▁the ▁' D iver ▁B elt ' ▁was ▁re organ ised , ▁with ▁the ▁mobile ▁H AA ▁guns ▁being ▁replaced