After leaving Fort Klamath, Drew and his men proceeded to the Williamson River, and then along the Sprague River, following the river to its source. Drew led his party over the low mountains into what in now Drews Valley and then over Drews Gap into the Goose Lake Valley. The expedition traveled around the north end of Goose Lake and then south along the east side of the lake for 21 miles until their path crossed the Applegate Trail. At that point, Drew met several immigrant parties. Fearing Indian attacks, the civilian parties decide to follow Drew's troops. The expanded company took Fandango Pass over the Warner Mountains into Surprise Valley. They then traveled northwest, passing around the north end of Cowhead Lake and over broken high desert country into the Warner Valley. Drew's party left the Warner Valley, moving east to the Pueblo Valley, and then north to the Army post at Camp Alvord east of Steens Mountain. The last immigrant wagon reached Camp Alvord on August 31.