15th Cavalry Division (United States)

The 15th Cavalry Division was a cavalry division of the United States Army during World War I, the only United States cavalry division formed during the war.

It was created with three cavalry brigades between November 1917 and February 1918 in Texas and Arizona, and included the Regular Army cavalry regiments that had guarded the Mexico–United States border. The division was originally trained for deployment to Europe, but only two of its regiments were sent there. The division was inactivated on 12 May 1918 and its remaining units sent back to the border as replacement National Army regiments were considered insufficiently trained. Elements of the division were reconstituted as the 1st Cavalry Division in 1921.