 The next day, they participated in the Union's assault on Fort Mahone, and began the occupation of Petersburg (April 3), continuing in operations related to this action until their regiment was honorably mustered out on July 17, 1865.Following his return to Pottsville, Pennsylvania with his regiment, Monaghan married Bridget Derrick circa 1870.A fellow County Mayo resident, she had emigrated circa 1849.