Editing George B. McClellan (section)

==Dates of rank==
{{unreferenced section|date=November 2021}}
{| class="wikitable"
|+
! Insignia !! Rank !! Component !! Date
|-
|[[File:Union army 2nd lt rank insignia.jpg|75px|class=noviewer]] || [[Second lieutenant|Brevet 2nd Lieutenant]] || [[Regular Army (United States)|Regular Army]] || July 2, 1846
|-
|[[File:Union army 2nd lt rank insignia.jpg|75px|class=noviewer]] || [[Second lieutenant|2nd Lieutenant]] || [[Regular Army (United States)|Regular Army]] || April 24, 1847
|-
|[[File:Union army 1st lt rank insignia.jpg|75px|class=noviewer]] || [[First lieutenant|Brevet 1st Lieutenant]] || [[Regular Army (United States)|Regular Army]] || August 20, 1847
|-
|[[File:Union army cpt rank insignia.jpg|75px|class=noviewer]] || [[Captain (United States O-3)|Brevet Captain]] || [[Regular Army (United States)|Regular Army]] || September 13, 1847
|-
|[[File:Union army 1st lt rank insignia.jpg|75px|class=noviewer]] || [[First lieutenant|1st Lieutenant]] || [[Regular Army (United States)|Regular Army]] || July 1, 1853
|-
|[[File:Union army cpt rank insignia.jpg|75px|class=noviewer]] || [[Captain (United States O-3)|Captain]] || [[Regular Army (United States)|Regular Army]] (resigned January 16, 1857) || March 4, 1855
|-
|[[File:Union army maj gen rank insignia.jpg|75px|class=noviewer]] || [[Major general (United States)|Major General]] || [[Volunteer military|Volunteers]] || April 23, 1861
|-
|[[File:Union army maj gen rank insignia.jpg|75px|class=noviewer]] || [[Major general (United States)|Major General]] || [[Regular Army (United States)|Regular Army]] (resigned November 8, 1864) || May 14, 1861
|}