Daniel Ullmann was born in Wilmington, Delaware, on April 28, 1810, and was graduated from Yale in 1829. After studying law, he was admitted to the bar in New York City, where he maintained a large practice and was for several years a master in chancery. In 1851 he was the Whig candidate for state attorney general, and three years later ran for governor on the Know-Nothing ticket. When the Civil War broke out Ullmann aided in recruiting the 78th New York ("78th Highlanders") and was commissioned its colonel on April 28, 1862. After some preliminary garrison duty, the command took part in the campaign of Second Manassas in Augur's division of Banks's corps. In the course of the retreat from Cedar Mountain, prior to which Ullmann had been prostrated by typhoid, he was captured and imprisoned in Richmond until October when he was released on parole. On January 13, 1863, he was advanced to brigadier general and sent to New Orleans to organize five Negro regiments, which formed the nucleus of the "Corps d'Afrique." He was present with a part of his command at the siege of Port Hudson, and until November, 1864, he remained at Port Hudson, a large part of the time acting as commander of the post. He was then assigned to command of the post at Morganza, Louisiana, where he was on duty until February 26, 1865, when he was relieved and ordered to Cairo, Illinois, to await orders. From there he was ordered home and saw no further service. Despite this somewhat unimpressive record he was awarded the brevet of major general for "meritorious service during the war." Upon his muster out of the army in August, 1865, General Ullmann retired from public life, and made his home near Nyack, New York. He traveled extensively and devoted much time to scientific and literary studies. He died on September 20, 1892, at his Nyack residence and was buried in Oakhill Cemetery, Nyack.
Reference: Generals in Blue. Lives of the Union Commanders by Ezra J. Warner. Louisiana State University Press. Baton Rouge.