Among the cottonwood groves of the Yellowstone, Clark's men quickly fashioned a pair of dugouts, lashed together with rawhide; and in these frail barks, twenty-eight feet long, the Captain and party embarked, leaving Sergeant Pryor, Shannon, Windsor, and Hall to bring on the horses. All manner of trouble Pryor had with those horses. Lame from continual travel, he made moccasins for their feet. They were buffalo runners, trained for the hunt. At sight of the Yellowstone herds away they flew, to chase in the old wild Indian fashion of their red masters. No sooner had Pryor rounded them up and brought them back than they disappeared utterly,—stolen by the Crows. Not one of the entire fifty horses was ever recovered.
Here was a serious predicament. Down the impetuous Yellowstone Clark's boats had already gone. Alone in the heart of the buffalo country these four men were left, thousands of miles from the haunts of civilised man.
"We must join Captain Clark at all hazards. We must improvise boats," said Shannon.
Sergeant Pryor recalled the Welsh coracles of the Mandans. "Can we make one?"
Long slim saplings were bent to form a hoop for the rim, another hoop held by cross-sticks served for the bottom. Over this rude basket green buffalo hides were tightly drawn, and in these frail craft they took to the water, close in the wake of their unconscious Captain.
And meanwhile Clark was gliding down the Yellowstone. On either bank buffaloes dotted the landscape, under the shade of trees and standing in the water like cattle, or browsing on a thousand hills. Gangs of stately elk, light troops of sprightly antelopes, fleet and graceful as the gazelle of Oriental song, deer of slim elastic beauty, and even bighorns that could be shot from the boat. Sometimes were heard the booming subterranean geysers hidden in the hollows of the mountains, but none in the party yet conceived of the wonders of Yellowstone Park that Coalter came back to discover that same Autumn.
One day Clark landed to examine a remarkable rock. Its sides were carved with Indian figures, and a cairn was heaped upon the summit. Stirred by he knew not what impulse, Clark named it Pompey's Pillar, and carved his name upon the yielding sandstone, where his bold lettering is visible yet to-day.
More and more distant each day grew the Rockies, etched fainter each night on the dim horizon of the west. More and more numerous grew the buffaloes, delaying the boats with their countless herds stampeding across the Yellowstone. For an hour one day the boats waited, the wide river blackened by their backs, and before night two other herds, as numerous as the first, came beating across the yellow-brown tide.
But more than buffaloes held sway on the magic Yellowstone. Wrapped in their worn-out blankets the men could not sleep for the scourge of mosquitoes; they could not sight their rifles for the clouds of moving, whizzing, buzzing, biting insects. Even the buffalo were stifled by them in their nostrils.
Nine hundred miles now had they come down the Yellowstone, to its junction with the Missouri half a mile east of the Montana border, but no sign yet had they found of Lewis. Clark wrote on the sand, "W. C. A few miles further down on the right hand side."