Who gave the unit their nickname, “Hellfighters” and for what reason?

infantry regiment  

One of the few black combat regiments in World War I, they'd earned the prestigious Croix de Guerre from the French army under which they'd served for six months of “brave and bitter fighting.” Their nickname they'd received from their German foes: “Hellfighters,” the Harlem Hellfighters.

literally just took the test, got a 100%. i couldn't be bothered to type it all out, so i just took pictures.

should be in order from q 1 to 35.