EXDAC, you were very lucky. I know of one fatality and one very near miss, involving barbed-wire, both in Alberta. Both were at airports, not out landings – one undershoot and one overrun.
I know it is not applicable to your incident, but I tell students that if they are heading towards a wire fence, even at slow speed, drop a wing and ground loop the glider. Much better to go through the fence backwards!