rokossovsky, polish-born and a soviet marshal, halted the advancing troops at the gates of warsaw in 1944 to give the ss. and gestapo troops time and freedom to massacre the polish resistance army.

This is all lower case. Can you fix that?
Rokossovsky, Polish-born and a Soviet marshal, halted the advancing troops at the gates of Warsaw in 1944 to give the SS. and Gestapo troops time and freedom to massacre the Polish resistance army.