It was the largest bear they'd ever seen, a great grizzly bear that weighed an estimated 600 pounds. A "most tremendous looking animal, and extreemly hard to kill," wrote Lewis in his journal on May 5, 1805. Clark described the grizzly as "verry large and a turrible looking animal." Clark and another member of the expedition fired 10 shots at it before it died.
Several tribes of Native Americans had told Lewis and Clark about grizzly bears. The tribes would only attack these great bears if there were 6-10 people in their hunting party, and even then the bears would sometimes kill one of them. The first grizzlies Lewis saw during the expedition were two smaller bears. He and another hunter had easily killed one of them. That day Lewis wrote in his journal that although the Native Americans with their bows and arrows might have problems, the grizzlies were no match for skilled rifleman. He soon changed his mind.
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.
The bears chased members of the Corps through the woods, into bushes, into the water. On July 15, 1806, Hugh McNeal was out alone on horseback. All of a sudden he saw a grizzly bear in the bushes. His horse bucked and threw McNeal near the bear. The bear raised itself up to attack. What could McNeal do at such close range? He hit the bear with his gun. The bear was temporarily stunned and fell down. McNeal quickly climbed up a nearby tree. Because of their large size and straight claws, grizzly bears aren't good tree climbers, so the bear waited at the base of the tree. And waited. And waited. Finally just before dark, the bear gave up and left. McNeal climbed down and got back to camp safely.
By the end of the expedition Lewis believed that the Corps had been very lucky to not lose anyone to a grizzly bear. He wrote that "the hand of providence has been most wonderfully in our favor."