In the years after the 1812-1814 war, the British army sent H.J. Warre to visit Oregon. In his travels, he sketched the countryside and the people.
Some of his work, in manuscript form, is hereSir Henry Warre. See, perhaps, pages 190, 222, and 422. Biographical information is on page 18.
The images above are courtesy of Canadiana.ca, which curates a huge online archive related to Canadian history.