From the Yellowstone to the Musselshell Summary and Analysis

On April 28, 1805, Lewis continues to document his observations of the spectacular wilderness of the region. He says that while the antelope is extremely fast on land, it is a very poor swimmer; the wolves usually catch them whenever they get in the water. His own dog caught an antelope in the river, drowned it and brought it back to shore. On May 4th, the party is delayed in the morning while repairing the pirogues. The river bottom is covered with timber, making the water much harder to navigate safely.

There is plenty to hunt for the men in this area of the continent. The hunters manage to kill a huge grizzly, but not without problems. They have to shoot him 10 times, and the animal still swims half way across the river...