For anyone curious, there is absolutely no evidence of coordinated violence between Neanderthals and Homo Sapiens [0], and it is believed that war developed during the Neolithic when well defined territories became more important.
There's evidence of multiple instances of interbreeding, with neanderthal DNA exclusively entering the sapien gene pool through the female line, and sapien DNA exclusively entering the neanderthal gene pool through the male line. If it was just "to the victor go the spoils" you'd expect a mix as sometimes one side would win and sometimes the other over the thousands of years. We know for a fact that it couldn't have been just "sapiens always won" because Sapiens entered europe, interbred enough to completely replace the Neanderthal y chromosome, and then died out about 30,000 years before the second expansion which succeeded. The evidence is much better explained by only male sapiens-female neanderthal couplings producing fertile offspring, which is a common thing for hybrids.
There's evidence of multiple instances of interbreeding, with neanderthal DNA exclusively entering the sapien gene pool through the female line, and sapien DNA exclusively entering the neanderthal gene pool through the male line. If it was just "to the victor go the spoils" you'd expect a mix as sometimes one side would win and sometimes the other over the thousands of years. We know for a fact that it couldn't have been just "sapiens always won" because Sapiens entered europe, interbred enough to completely replace the Neanderthal y chromosome, and then died out about 30,000 years before the second expansion which succeeded. The evidence is much better explained by only male sapiens-female neanderthal couplings producing fertile offspring, which is a common thing for hybrids.
[0] https://www.discovermagazine.com/the-sciences/did-ancient-hu...