One of the stranger justifications I sometimes run across for the holy war commands against the Canaanites is the claim that the Canaanites weren't human. They were Nephilim. Angel/human hybrids. There are some problems with that interpretation:
i) That's not a reason given for why they were to be cleared from the Promised Land.
ii) If they were hybrids, they'd have superhuman abilities, so it's unclear how they could be defeated by the inferior Israelites.
In principle, God could provide divine assistance to level the playing field, but in general the war narratives don't have the Israelites using anything other than conventional means.