Lewis was out scouting alone on June 15, 1805. He decided to make camp and shot a buffalo. As he was watching the buffalo fall, a grizzly bear came rushing towards him. Lewis raised his gun to shoot and then realized he had not reloaded his riffle. The bear was getting closer. There were no trees or bushes nearby, but there was a river. Lewis quickly ran into the water. The bear followed. When the bear saw Lewis in the water, for no apparent reason he stopped and ran in the other direction. Lewis was lucky. After that he thought that the Corps (Lewis and Clark's expedition party) should not go out alone. Even at camp, he thought they should sleep with their guns beside them in case of bear attacks.