Senator Knox was sold to the US Army remount program at the age of 7 by Joseph C. Brunk. He had been serving with the US Government remount service since 1923 and in 1939, at the age of 23, after tootling around remount stations in Texas and Wyoming, Senator Knox, via the directed attention of Helen Greenwalt and facilitated by Major Graham, US Army Remount Service, landed at the Elmer Brown Piedmont Land and Cattle Co. farm, Halstead, Kansas. Reclaimed from the US Army Remount Service by Helen Brunk Greenwalt to preserve the Brunk bloodlines. Brown bred Senator Knox to 4 mares, 3 of his own and one provide to him by Helen named Fanita 04736. There were 4 foals born in 1940, and Fanita produced a colt. Helen would transfer Fanita to Brown with the understanding that she would have the colt Senator Graham foaled April 20, 1940. Senator Knox died in late 1939 and the Elmer Brown foals were the last of his get.