Trouble began in the copper mining districts of Arizona as the Union (IWW) became unmanageable. On 5 July 1917 a provisional squadron, under the command of Lieutenant Colonel White, marched north to Globe, Arizona, for strike duty. Later that month, forest fires in Mormon Canyon (Turkey Creek) grew beyond the control of the forest rangers, prompting another call for assistance by the civil leaders; a detail of fifty men under Second Lieutenant Arthur S. Harrington was deployed to assist them. The regiment would remain in the Southwest until the end of World War I. After the Armistice with Germany was signed in November 1918, the regiment was under orders to move to Hawaii. Among the junior officers who served with the 17th Cavalry was First Lieutenant Lucian Truscott, later to become a four-star general officer.