▁sixth ▁claim ▁was ▁file d ▁on ▁ 2 4 ▁April ▁following ▁combat ▁in ▁defense ▁of ▁" Circ us " ▁No . ▁ 1 3 2 . ▁That ▁day , ▁the ▁R AF ▁target ed ▁oil ▁install ations ▁at ▁V l iss ingen ▁and ▁Wal ch eren ▁in ▁the ▁Netherlands . ▁II . ▁Gruppe ▁took ▁off ▁from ▁A be ville , ▁head ed ▁for ▁Cap ▁Gr is - N ez ▁and ▁attacked ▁No . ▁ 2 3 4 ▁Squadron , ▁shooting ▁down ▁four ▁Sp it f ires . ▁One ▁victory ▁was ▁cred ited ▁to ▁Gall and ▁who ▁shot ▁down ▁a ▁Sp it fire ▁near ▁Cap ▁d ' Al bert . ▁On ▁ 1 ▁May , ▁four ▁" R ode os " ▁and ▁" Circ us " ▁No . ▁ 1 5 0 ▁attacked ▁various ▁targets ▁in ▁northern ▁France . ▁II . ▁Gruppe ▁engaged ▁the ▁Horn ch urch ▁and ▁North ▁We ald ▁Wing . ▁During ▁this ▁encounter , ▁Gall and ▁shot ▁down ▁a ▁Sp it fire ▁from ▁either ▁No . ▁ 1 2 2 ▁or ▁No . ▁ 2 2 2 ▁Squadron ▁in ▁the ▁vic inity ▁of ▁D over . ▁ ▁Squadron ▁leader ▁On ▁ 4 ▁May ▁ 1 9 4 2 , ▁Gall and ▁was ▁transferred ▁to ▁ 5 . ▁Staff el ▁( 5 th ▁squad ron ) ▁of ▁J G   2 6 . ▁There , ▁Gall and ▁replaced ▁Ober le ut nant ▁Wolfgang ▁Kos se ▁as ▁squad ron ▁leader , ▁at ▁first ▁as ▁Staff elf ühr er ▁and ▁later ▁officially ▁as ▁Staff