out side ▁the ▁enemy ▁crew ' s ▁usual ▁field ▁of ▁view . ▁An ▁attack ▁by ▁a ▁Sch rä ge ▁Musik - equ ipped ▁night ▁f ighter ▁typically ▁came ▁as ▁a ▁complete ▁surprise ▁to ▁the ▁bom ber ▁crew , ▁who ▁real ised ▁a ▁night ▁f ighter ▁was ▁close ▁by ▁only ▁when ▁they ▁came ▁under ▁fire . ▁It ▁is ▁not ▁exactly ▁known ▁when ▁Sch n au fer ' s ▁B f ▁ 1 1 0 ▁was ▁equ ipped ▁with ▁Sch rä ge ▁Musik . ▁R ump el hardt ▁stated ▁that ▁the ▁weapons ▁system ▁was ▁installed ▁prior ▁to ▁his ▁return ▁from ▁officer ▁training . ▁It ▁is ▁also ▁not ▁exactly ▁known ▁how ▁many ▁of ▁his ▁vict ories ▁had ▁been ▁claimed ▁using ▁the ▁up wards ▁firing ▁can n ons . ▁According ▁to ▁Fritz ▁Eng au , ▁who ▁had ▁known ▁Sch n au fer ▁since ▁Flug zeug führ ersch ule ▁C ▁ 3 , ▁ 2 0 ▁to ▁ 3 0 ▁of ▁Sch n au fer ' s ▁aer ial ▁vict ories ▁had ▁been ▁claimed ▁using ▁up wards ▁firing ▁guns . ▁ ▁R ump el hardt ▁had ▁returned ▁from ▁his ▁officer ▁training ▁courses ▁in ▁early ▁October ▁ 1 9 4 3 ▁and ▁rejo ined ▁Sch n au fer ' s ▁crew . ▁G ä ns ler , ▁R ump el hardt ▁and ▁Sch n au fer ▁claimed ▁aer ial ▁vict ories ▁ 2 9 ▁and ▁ 3 0 ▁on ▁ 9 ▁October . ▁Ober le ut nant ▁Sch n au fer ▁was ▁awarded ▁the ▁Knight ' s ▁Cross ▁of