Me and Swampy don't agree much, but Florida and East Texas has had wild hogs for over a hundred years. Swampy's pretty much right. NOW! You corner a boar, or make him THINK he's cornered, and he'll charge tryin to get by you. A sow is most likely to fight IF you get between her and her babies.
I've been around'em, and hunted them all my life, and they are more interested in getting away than fightin. That's why they'll run till their cornered, and why their mostly nocturnal. They want nothing to do with humans. It's also like the myth that their hard to kill. Mostly promoted by folks that weren't raised around them. Their no harder to kill than a whitetail, if you know where to hit them.