▁Northern ▁Ireland , ▁and ▁the ▁north ▁of ▁England . ▁ 1 3 ▁Group ▁was ▁d uly ▁reform ed ▁on ▁ 1 5 ▁March ▁ 1 9 3 9 . ▁During ▁the ▁initial ▁stages ▁of ▁World ▁War ▁II , ▁No . ▁ 1 3 ▁Group ▁was ▁Command ed ▁by ▁Air ▁Vice ▁Marsh al ▁Richard ▁Sa ul . ▁ ▁The ▁Dow ding ▁System ▁in ▁ 1 3 ▁Group ▁Like ▁the ▁other ▁groups ▁into ▁which ▁f ighter ▁command ▁were ▁divided , ▁no . ▁ 1 3 ▁Group ▁operated ▁the ▁Dow ding ▁system ▁of ▁f ighter ▁control . ▁The ▁ 1 3 ▁Group ▁H Q ▁was ▁at ▁Kent on , ▁near ▁New castle ▁upon ▁Ty ne ▁with ▁the ▁Filter ▁Room ▁at ▁nearby ▁Bla kel aw ▁Qu ar ry . ▁The ▁sector ▁air fields ▁were : ▁R AF ▁A ck ling ton ▁R AF ▁Dy ce ▁R AF ▁In ver ness ▁R AF ▁Turn house ▁R AF ▁U sw orth ▁R AF ▁W ick ▁ ▁Battle ▁Of ▁Britain ▁As ▁well ▁as ▁guard ing ▁the ▁north ▁during ▁the ▁Battle ▁of ▁Britain , ▁ 1 3 ▁Group ▁also ▁provided ▁reserve ▁squad rons ▁and ▁pil ots ▁to ▁the ▁more ▁be le ag uer ed ▁ 1 1 ▁Group , ▁and ▁provided ▁qui eter ▁bases ▁for ▁squad rons ▁to ▁recuper ate ▁from ▁operations . ▁ ▁The ▁ 1 3 ▁Group ▁also ▁contributed ▁to ▁pilot ▁education ▁by ▁producing ▁its ▁" For get - Me - N ots ▁for ▁F igh ters " ▁bro ch ure ▁that ▁included ▁a ▁for ew ord ▁by ▁Air