Not until we have batteries with higher energy to mass ratio than chemical fuels. And currently batteries are nowhere near that. Else imagine somebody starting every single combustion engine in that army just before attack. Or conditions like ww2 eastern front during winter, I would love to see those robots there marching as planned.
For eg in us army Tooth to Tail ratio is 80% to 20%. So those very expensive and complicated robots will not change much. Unless we get something like “universal assembler” ie. 100% automated factory that can produce everything from raw materials. But then war over some silly things on planet Earth is pointless, if i had such factory i would send it to moon or asteroid belt. Kickstart economy there, be first to conquer that instead of down here.