 After the fall of Port Hudson, Augur was assigned command of the XXII Corps and the Department of Washington which he held from October 13, 1863 to August 13, 1866.Augur was one of the Army officers who were present at the Petersen House where the mortally wounded President Abraham Lincoln was taken after he was shot by John Wilkes Booth.At Secretary of War Edwin Stanton's request, Augur went into the street and called out for a competent phonographer who knew shorthand well enough to take verbatim notes for Stanton as he interviewed witnesses to that night's tragic event.