Lewis: up Marias River / Clark: down Yellowstone — Patrick Gass: July 21, 1806

out for the horses; and the rest of us put two canoes on the
waggons, and moved them forward by hand some distance,
when the man returned without finding the horses. Two
more men went out to look for them, and at noon came back
without finding them. In the afternoon some more men went
to look for them, who at night returned also without seeing
any thing of them; and we lay where the canoes were all
night. ;