During the 1806 return journey from the Pacific Ocean, Captains Meriwether Lewis and William Clark traveled separate routes to explore more territory. Captain Clark and ten men, together with Sacagawea and her infant son Jean Baptiste, called "Pomp" by Clark, traveled east on horseback along well-worn Indian and buffalo trails on the north side of the Yellowstone River. The party spent three days in what is now Sweet Grass County hunting, making moccasins of green buffalo skin for lame horses whose feet were worn smooth and raw, and exploring. On July 16, 1806, Clark wrote of chasing a white or gray bear on horseback for about two miles across the plains before giving up. He also recorded that as the party was setting out, two buffalo bulls came near camp, the men shot at one, and it plunged into the river, swam across, and died on the opposite side. On July 17, 1806, Clark noted seeing a single pelican, the first he had seen on that river, and also saw an Indian fort built of logs and bark, which Sacagawea said war parties made when pursued to defend themselves against pursuers with superior numbers.