<Li> August 3: Clark arrives at confluence of Missouri and Yellowstone Rivers--moves down river because of mosquitoes . </Li> <Li> August 8: Pryor and party reached Clark . Pryor and party (Sgt . Pryor, G. Gibson, H. Hall, R. Windsor) left Clark with horses and a letter to Hugh Henry to get Sioux to go to Washington and make peace with other natives . Horses stolen, had to make bull boats to get across and down river . </Li> <Li> August 11: Lewis is accidentally shot by a member of his own party . </Li> <Li> August 12: The two groups rejoin on the Missouri River in present - day North Dakota . </Li>

They were lewis and clark clark and lewis