What if early during World War 1 a team of German scientists had unlocked the methods to reanimating the recently deceased? Using a combination of a chemical compound similar to Herbert West Reanimator and electricity ala Frankenstein, creating undead revenant styled being. With them being able to take it a step further by being capable of building Frankenstein esque constructions similar to below. View: https://youtu.be/UIgBoHr18-I
How would this effect course of the Great War with the Kaiserreich now potentially having unlimited manpower?