Fort Sill was staked out in January 1869 by MG Philip H. Sheridan as he was leading a campaign into Indian Territory to stop hostile tribes from raiding border settlements in Texas and Kansas. Troops from the 10th Cavalry, the elite unit of African-American "Buffalo Soldiers" constructed many of the stone buildings still surrounding the Old Post Quadrangle.
The misson of Fort Sill is to train soldiers and Marines, and develop Field Artillery leaders; design and develop fire support for the force; support unit training and readiness; mobilize and deploy operating forces; and maintain installation infrastructure and services.
Fort Sill houses the Field Artillery School, the primary training facility for field artillery soldiers and marines worldwide; the Field Artillery Training Center, home of basic combat, one-station unit training, and advanced individual training; and is the largest field artillery complex in the free world.
Official website for Fort Sill.