American settlers began to arrive from the east by the Oregon Trail starting in the early 1840s, and came in increasing numbers each subsequent year. Increased tension led to the Oregon boundary dispute. Both sides realized that settlers would ultimately decide who controlled the region. The Hudson's Bay Company, which had previously discouraged settlement as it conflicted with the lucrative fur trade, belatedly reversed their position. In 1841, on orders from Sir George Simpson, James Sinclair guided more than 100 settlers from the Red River Colony to settle on HBC farms near Fort Vancouver. The Sinclair expedition crossed the Rockies into the Columbia Valley, near present-day Radium Hot Springs, British Columbia, then traveled south-west down the Kootenai River and Columbia River following the southern portion of the well established York Factory Express trade route.