Begger! Did the same on mine - the front diff has a guard but the rear hasn't been fitted yet (waiting to get the right bolts). They are worth their weight in gold I reckon! Luckily here too no harm done. By next time I'll have both diff guards and tank guard. And then slightly later new (and slightly larger) tyres - wahoo!
Scar house was a spur of the moment decision by me at the last minute as it was on the way back, i'd forgotton it got a bit rocky part way up and that I was supposed to be leading a gentle trip - ooops & apologies