These tools are likely weapons of war. Finding many weapons at the top of a hill is consistent with a battleground. The Neanderthals lost. Hunted animals usually try to run and hide, not run to the top of a hill for a better view. And tools are not typically disposed of at the top of a hill. Occam’s razor points to this being a battleground and the thriving Neanderthals were wiped out in war.
Closely related: a stocked hilltop strong point in case of a need to fight.
Cahe the weapons ahead of time, since there may not be time to gather enough at need.
Ancient counterpart to one of Solomon’s “chariot cities”.
Yes, it’s easy to lose a battle form the most defensible position.