[3] Greenly served through much of the Mexican–American War, where troops from Michigan were sent such as Company K, 3d Dragoons, as well as A, E, and G of the U. S. Infantry.

After his brief time as governor, Greenly served as justice of the peace for 12 years.

He was elected mayor of Adrian, Michigan in 1858, serving only one year.

Following her death, he married Elizabeth W. Hubbard in Northampton, Massachusetts, on June 11, 1840.

Following Elizabeth's death, he married Maria Hart in Adrian, Michigan, on October 25, 1859