Horatio’s war time military service would get off to a bad start. He was tasked with assisting in the destruction of the Gosport Navy Yard to keep it from falling into Confederate hands. It did not go well and Horatio found himself a prisoner of war. Released four days later, he would serve as the chief engineer for the 3rd Division during the First Battle of Bull Run. Promoted to major that August and then again to brigadier general of volunteers the following month. He proved successful in leading troops at Jacksonville, St. Augustine and several other military targets throughout Florida. It would lead to his appointment to major general of volunteers and commander of the newly created Army of the Ohio. He would play a critical role in the repulse of Confederate General Braxton Bragg’s invasion into Kentucky. In May, 1863 he was given command of the 1st Division in the VI Corps of the Army of the Potomac. He would be held in reserve at Gettysburg but would see action at Mine Run and the Battle of the Wilderness. Following Sedgewick’s death at Spotsylvania, he assumed command of the VI Corps. The corps would fight at Cold Harbor before Wright was dispatched to Washington to assist in defending against Jubal Early’s raid in July, 1864. He would command the corps again during Sheridan’s Shenandoah Valley Campaign. Wright would lead the fight at Cedar Creek until Sheridan arrived to take over command. During the Siege of Petersburg the VI Corps was the first to break through Confederate lines and defeated Confederate forces at Sayler’s Creek capturing a large portion of rebel forces. As a result of his actions at Petersburg he would be promoted to brevet major general in the regular army. Post war he would be promoted to lieutenant colonel of engineers and be involved with engineering projects including the Brooklyn Bridge and the Washington Monument. No back mark on this one.