[2][3][4] With the outbreak of the Spanish–American War, Truman volunteered and joined Teddy Roosevelt's Rough Riders, traveling to San Antonio, Texas, where he joined Jim McClintock's company, before traveling on to Tampa, Florida.

Shortly before leaving for the war, Truman married Mary Collingwood.

While in Cuba, Truman contracted malaria, and recuperated in Utica, New York, before returning to Arizona.

[4] In 1928 he ran for the single Arizona State Senate seat from Pinal County.

He was unopposed in the Democrat's primary, and was won the November general election.