Something often left out of fiction about war is how easily a moving army can overwhelm a local ecosystem, particularly if its supply lines sag. You might not even be their target, and yet you will be pillaged. No more easy hunting for you for years. No more quick trips for firewood, or tinder.

It stands to reason that if an occupying force doesn’t stay long in an area, and its animals die along the way, that the now destitute locals will take the “road kill” and scrounge every possible calorie from it. And marrow was a dish rather than something for soup stock up until the modern era. The Illiad basically won’t shut up about it.

So I have no doubt that every dead elephant anyone could find was 100% rendered down into food and leather by the beleaguered locals. And probably every cousin from one village over got told about the find too. (I suspect elephant leather would make amazing peasant shoes)