The South African War had seen the largest British Army ever to leave Britain, and with the end of that War on 31 May 1902 "active Service" effectively ceased. Baden-Powell was given the role of organising the South African Constabulary, a colonial police force, but during this phase, Baden-Powell was sent to Britain on sick leave, so was only in command for seven months. He returned to England to take up a post as Inspector-General of Cavalry in 1903. While holding this position, Baden-Powell was instrumental in reforming reconnaissance training in British cavalry, giving the force an important advantage in scouting ability over continental rivals. Also during this appointment, Baden-Powell selected the location of Catterick Garrison to replace Richmond Castle which was then the Headquarters of the Northumbrian Division. In 1907 he was promoted to Lieutenant-General but was left on the inactive list. Eventually, he was appointed to the lowly command of the Northumbrian Division of the newly formed Territorial Force.