We camped, his pack string was loose, just following along. He'd turn the mules loose at night to eat, leaving only their mother, a buckskin QH, in camp, and only needing to bring enough feed for her. They stuck ~fairly~ close, though he was gone a good while looking for them some mornings ;~D
Sounds like a great trip and what a great picture! Though I can tell it was taken some time ago. ;o) How old were you then, maybe 20?