in Alaska." At the time Allen was ranked as a lieutenant and served as General Nelson A. Miles's aide-de-camp. He supervised Lieutenant William R. Abercrombie's shipments from Sitka to Nuchek. Allen was later sent by Miles to search for Abercrombie, whom Miles had sent to explore the Copper River. Eventually, Allen discovered Abercrombie close to the mouth of the river. Due to the moving glaciers and rough terrain, Abercrombie did not succeed in going more than up the river. Following the expeditions of Frederick Schwatka, which covered a lot of Alaskan land but did not contribute much to a map of the area, and Abercrombie, who had failed to make it through the lower canyons of the Copper, Allen devised a plan to explore both the Tanana and Copper rivers, which were two of the biggest uncharted rivers in Alaska. Miles gave permission for Allen to go ahead with his plan, however Miles had wanted at minimum four to ten men and one medical officer to be included on the trip. Allen insisted on only three men including himself and General Philip Sheridan finally approved of Allen's original trio plan. With Sgt. Cady Robertson and Pvt. Fred Fickett and $2,000, in the spring of 1885, Allen arrived at the Copper River Delta. Allen's plan of action was to reach the headwaters of the Copper River on ice. Though he had little proper food, faced freezing rain, and difficult terrain, Allen continued to move ahead north along the river. John Bremner joined the expedition when Allen came to Taral, an Indian village. Although Allen's supplies were dwindling, he was able to explore the Chitina River, the Copper River's major tributary. During the expedition, Allen learned how to build and navigate skin boats like the Indians in the region. With these boats they moved upriver, losing more and more provisions along the way. On one occasion they had to eat "rotten, wormy meat." After the detachment took up new guides, Allen and his men decided to leave the Copper River and cross into the Alaska Range through a portal that Allen named Miles Pass. They became the first men to chart the rugged river and one of the highest mountain ranges in North America. When one of the enlisted men and Bremner received scurvy from their poor diets, Allen refrained from exploring the Tanana to its headwaters and decided to head to