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Commanded by Major General John Dix
| Fourth Corps | Major General Erasmus Keyes | |
| Fortress Monroe and Camp Hamilton | ||
| 3rd New York Infantry Regiment | ||
| 2nd Wisconsin Battery | ||
| 4th Wisconsin Battery | ||
| Yorktown | ||
| Busteed’s Independent Brigade | Brigadier General Richard Busteed | organized 12/15 |
| Seventh Corps | Major General John J. Peck | |
| Norfolk District | Brigadier General Egbert L. Viele | |
| 7th New York Independent Battery | Captain Peter C. Regan | |
| 99th New York Infantry Regiment | Colonel David W. Wardop | |
| 148th New York Infantry Regiment | ||
| 173rd Pennsylvania Infantry Regiment | Colonel Daniel Nagle | |
| 19th Wisconsin Infantry Regiment | ||
| 4th United States Artillery, Battery D | ||
| Division at Suffolk | Major General John J. Peck | |
| Corcoran’s Brigade | Brigadier General Michael Corcoran | |
| Empire Brigade | Brigadier General Francis B. Spinola | |
| Ferry’s Brigade | Brigadier General Otis S. Ferry | |
| Foster’s Brigade | Colonel Robert S. Foster | |
| Gibbs’ Provisional Brigade | Colonel Alfred Gibbs | created 12/5 |
| Wessel’s Brigade | Brigadier General Henry Wessels |