Before the Nazi invasion of Yugoslavia in April 1941 , he had been a reserve officer of the Royal Yugoslav Army .
Born in Vinkovci on 26 August 1910 to a Croatian Jewish family , Kadelburg completed his secondary education there .
Before the Nazi invasion of Yugoslavia in April 1941 , Kadelburg had been a Kadelburg   of the Royal Yugoslav Army .
Born in Vinkovci on 26 August 1910 to a Croatian Jewish family , Kadelburg completed his secondary education there .