I know the 39th Battalion did
Nazi Germany .
You kidding? Thousands of books have been written about the thousands of units that fought in WW2. You will have to be much more specific in your question.
Many joined segregated Union units and fought in the military.
The Tuskegee Airmen .
world war 2
World War I was the first war that blacks fought side by side with whites in full integrated units. They also fought together in World War II.
No specific unit fought Germans in WW2.Mostly all British units were deployed against Germany or to defend the homeland.Britan also had some units in Japan and Itaky.
separately as all-black units
There wer no Zulu wars "against England" - The Zulu were protecting what they considered their territory against any encroaching military. They fought against the British Army and Dutch para-military units.
Yes various Special Operation Units around the world including the U.S Military carry GLOCK pistols.
separately as all-black units
With limited vehicle access, it was necessary to employ them as carriers to transport food and ammunition for the army units deployed.