Fuck. I mean ER.
How the fuck have I been misspelling that?
Oh well, It was 0030 =P
Oh right.
Injuries aren't really common - especially not serious ones - if your group has any idea what they're doing. I really encourage having some body protection too, even a thin aketon is gonna do a lot if you can combine it with maille, and a full gambeson is gonna protect you fine on its own unless some tit hits you in a joint, in which case it'll sting for a while.
I say that, we have a bunch of injured members right now, but only one of them was actually injured by us, ended up with a cut running from his top lip to his nose. Didn't require a trip to the hospital though, and the first aid guys were basically useless.
Worst injury I have is a 5mm long scar on my wrist from a hand-and-a-half sword which was aiming for my head at the same time I was trying to strike. The very slight amount of pain was worth it to have even the faintest scar I can attribute to a sword.