Apparently there has been some confusion between two artists with the initials W.W. Armstrong. The following information was found in an auction catalogue description for a painting by William Weaver Armstrong (see AskART):

"The work of William Weaver Armstrong has long been confused with that of William Wallace Armstrong (1812 - 1915 [sic]). The California art historian Edan M. Hughes established the distinctions between the two artists in 1985. William Wallace Armstrong was a Canadian artist who painted landscapes of the Great Lakes region, railway subjects, and Native Americans. He never visited or painted California, and William Weaver Armstrong never left California.

William Wallace Armstrong painted ex...