Rudel was a real historical person and aside the dramatization, he did sink the Soviet battleship Marat in his Stuka.
Any readers please be aware Rudel was also an unrepentant neonazi post-war, creating an organisation to help war criminals escape, became friends with Mengele in Argentina, worked as arms dealer, and as military advisor to Latin American dictators(Peron, Pinochet, Stroessner). In the 50s he came back to West Germany and aside a short trips back to Latin America, worked for, represented and acted as spokesperson for a multitude of neo-nazi political parties there all the way until his death in 1982. Quite a guy...