"Campaign in Russia– Waffen SS on the Eastern Front" by Leon Degrelle is an incredible read.

Descriptions about every environment encountered during the German push into Soviet territory is vivid, and there is a lot of ideological commentary on foreign opinions and views on the Nazis and their army.

Author was an extremely devout Catholic, just below Brigadier General in the Waffen SS, Belgian, and a former politician before joining the war with his party buddies