60% of the SS were foreign soldiers. The SS had so many Muslims fighting against Soviet occupation of their homelands that 3 SS schools for Muslim clerics were opened, 2 in Dresden and one in Guben.
The most important foreign Wehrmacht troops were the Cossacks, the Russian Vlasov army of one and a half Million men and some cases like the son of the Chinese leader Chang Kai Shek being tank commander in the Wehrmacht or the "Tiger Legion", Indian freedom fighters from Subhas Chandra Bose, trained by Wehrmacht and SS.
One of the darkest chapters of post WWII history is the "Operation Keelhaul", Churchill's forceful "repatriation" of 5 Million Eastern soldiers into Stalin's Red Empire, where all of them were murdered(lucky) or forced to work themselves to death in the Gulag.
Berlin, the heart of Germany in the end was defended in part by the French.
https://en.wikipedia.org/wiki/33rd_Waffen_Grenadier_Division_of_the_SS_Charlemagne_%281st_French%29 