Funny. When I was a kid, it was my job to feed/water the pigs. I was in the pen with them a lot. Had to really keep my eye on a couple of the sows though, though. They'd tag team me: one would get my attention while the other one would sneek up behind me and bite me on the butt. I'd turn to smack that one on the nose, and the other one would bite me on the butt. They thought it was great fun.
I've seen hogs chase down and eat a live chicken. Not a pretty sight.
Did the sows have litters?
Ours usually did and only my grandfather would feed them.
He wouldn't let the grandkids or gramma near them.
The boars didn't get to live long enough to grow huge tusks since they became sausage every Thanksgiving day *but* I've been around old boars with 7" tusks.
They can be nasty.
Back when I was doing crafts for bikers the local stock sale guys would give me the tusks they'd cut off the hogs before they auctioned them.
I have some pretty cool ones stashed around here somewhere.
I used to have a nearly 2/3 of a circle tusk I kept on my keychain until I dropped the keychain and the tusk shattered on the concrete pavement.
Pigs are very, very clever.
You're fortunate that yours were apparently amiable, as well...:)