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Mullan was spearheading the construction of a military road from Walla Walla to Fort Benton, and Sohon surveyed routes and monitored the construction progress.
In Washington Territory a wagon road from Wallula (Fort Nez Percés near Walla Walla) to the gold mining regions of British Columbia was known as the "Cariboo Trail" or the "Wallula-Okanogan Road".