Even before Oregon Country—the disputed area claimed in the early 1800s by both Great Britain and the United States—was officially claimed by Congress as a United States territory in 1846, pioneers had been traveling west to explore its bounty. Meriwether Lewis and William Clark had arrived at the Pacific Ocean in 1805, but the route was much too hazardous for families to replicate while traveling by wagon. In 1810, John Jacob Astor funded two separate expeditions—one by land and the other by sea—to establish a fur post at the mouth of the Columbia River. Enlistee Robert Stuart arrived via Cape Horn safely by ship, but after his vessel was blown up in an altercation with Native Americans, Stuart began an overland journey from Fort Astoria in present-day Oregon back to Missouri to request aid from Astor. During his yearlong voyage, Stuart became the first white man to discover a 20-mile gap in the Rocky Mountains through which wagons could safely pass.