Probably going to be at the top of the path, then.
Galder will be at the top of the mountain path when the fighting starts, but he is going to be part of the effort to set up the big avalanche in the middle since he has a decent Survival score.
After that, he'll go about setting up the Epireans.
He wants five Epireans at each of the guard posts. They can delay and maybe inflict a little damage, but mainly just notify us of the incoming guys without looking too suspicious.
The rest will be at the top of the path with us.