Weitzel was promoted to
first lieutenant of engineers in 1860. In 1861, he was reassigned to
Washington, D.C. in the Corps of Engineers. His company served as the bodyguard during the inauguration of U.S. President
Abraham Lincoln.
American Civil War When the American Civil War began, Weitzel was assigned to construct defenses, including in Cincinnati and Washington, as well as for
George McClellan in the
Army of the Potomac in late 1861. He was then attached to the staff of Major General
Benjamin F. Butler as chief engineer of the Department of the Gulf. When Union troops captured New Orleans, Weitzel became assistant military commander and acting mayor. He was promoted to
brigadier general in August 1862 and two months later routed a large force of the enemy at
Labadieville, Louisiana, which earned him a
brevet promotion to
major in the
Regular Army. Weitzel commanded a
brigade in the
XIX Corps advancing in Major General
Nathaniel P. Banks's operations in western Louisiana during April and May 1863, which led to the
siege of Port Hudson. Weitzel was later brevetted
lieutenant colonel in the Regular Army, "for gallant and meritorious services at the siege of Port Hudson," which fell on July 9, 1863, days after
Vicksburg, Mississippi, about 120 miles upriver, the last Confederate stronghold on the great Mississippi, had fallen. Together those successful sieges and the continuing blockage of Southern ports completed the
Anaconda Plan. Beginning in May through September 1864, Weitzel was assigned as chief engineer of the
Army of the James, still under General
Benjamin F. Butler, which was targeting the Confederate capitol, as well as its naval defenses under the remnants of the
James River Squadron. He was engaged in May at
Swift's Creek and the actions near
Drewry's Bluff and the
Bermuda Hundred Campaign (against his former commander, now Confederate General
P.G.T. Beauregard), and the
Deep Bottom in August. By month's end, Weitzel was brevetted major general of volunteers "for meritorious and distinguished services during the civil war." General Weitzel assumed command of the
XVIII Corps from September 1864 through the end of the year, and was brevetted
colonel in the regular army for the capture of
Fort Harrison (renamed Fort Burnham for the Union commander dying in the assault) on September 29. On November 7, 1864, Weitzel became a major general of volunteers and on December 3 was assigned command of the
XXV Corps, consisting of
U.S. Colored Troops under white officers. As the year ended, he participated in the unsuccessful
First Battle of Fort Fisher, guarding
Wilmington, North Carolina, the last major Confederate port. He and his corps were reassigned to
Virginia two weeks later, when General Butler was relieved of duty in favor of General
Alfred H. Terry, who captured the port on January 15. During the war's final months,
Ulysses S. Grant named Weitzel to command all Union troops north of the
Appomattox River during the final operations against
Robert E. Lee's
Army of Northern Virginia. Speaking to his men on February 20, 1865, Weitzel told them: After the fall of Petersburg, Confederate forces considered their capitol,
Richmond, indefensible. They evacuated and set fire to its military and tobacco storehouses during their retreat on the night of April 2. The blaze spread to surrounding residential and commercial buildings. The city's mayor,
Joseph Mayo traveled out along the Osborn Turnpike to
Tree Hill Farm to find a Union commander to whom to surrender the city that night, and ask for help quelling the blaze. He found Majors Atherton H. Stevens Jr. and Eugene E. Graves who took his note to Major General Weitzel, who rode in to Richmond's city hall and accepted the formal surrender document at 8:15 that morning. Thus, Weitzel took possession of Richmond on April 3, 1865, and his Union forces extinguished the fires. Weitzel soon established his headquarters in the home of
Jefferson Davis. His aide, Lieutenant
Johnston de Peyster, is credited with raising the first U.S. flag over the city after its capture by the Union. The next day, President Abraham Lincoln visited the
Confederacy's capital. Weitzel served as Lincoln's confidential aide and bodyguard during two days of peace negotiations with Confederate representatives. Days after Lincoln's assassination, Secretary of War
Edwin M. Stanton refused to believe the generous terms on which Lincoln would have allowed Virginia to rejoin the Union. In histories of
Masons' Hall in Richmond, it has been noted that Weitzel protected Masons' Hall from burning and looting in the time immediately after the Confederates' retreat from Richmond. Weitzel, who was a
Freemason, was requested by old Masons of the city to protect the Hall, and Weitzel granted their request and had sentinels posted so that no harm was done to it. In New Orleans in 1863, Weitzel had said that he didn't believe in "colored troops" and didn't want to command them, but after they had taken Richmond in 1865, in 1866, after the war's end, he reflected on the service of African American soldiers in the Union Army, stating:
Postwar career While other generals were feted at the end of the war, the German immigrant and his all-black Army corps were sent to Texas to evict the French who had occupied Mexico, which was considered one of the most difficult assignments. Weitzel remained in command of the District of Rio Grande until 1866, when he was mustered out of the volunteer service on March 1. He reverted to his regular Army rank, but was promoted to
major of engineers later that year and to
lieutenant colonel in 1882. In August 1866, he began designing an expanded canal around the
Falls of the Ohio on the Indiana side. In 1875, he established the temporary lighthouse on a pole in the lake at
Alpena, Michigan. In 1877, he built a crib for the second
Alpena Light. He also designed it as a timber building in the form of a brown wooden pyramidal tower, complete with a Sixth Order Fresnel lens. In July 1888, it burned with much of the town. In 1881, Weitzel completed the building of a lock at the
Soo Canal, at that time the largest canal lock in the world, and the next year the
Stannard Rock Lighthouse on
Lake Superior. He also helped design and build the
Spectacle Reef Light with
Colonel Orlando M. Poe. Transferred to
Philadelphia, he was in charge of engineering projects in the region and Chairman of the Commission Advisatory to the Board of Harbor Commissioners. ==Death and legacy==