Although the great majority of the Army of the Potomac were volunteer regiments furnished by the states, there was a core of United States Army Regulars in all three branches of service. |

|
|

|
1st & 2nd Regiments
United States Sharpshooters |
United States Infantry Regiments |

|
2nd United States Infantry |

|
8th United States
Infantry |

|
11th United States Infantry |

|
3rd United States Infantry |

|
10th United States
Infantry |

|
12th United States Infantry |

|
4th United States Infantry |

|
11th United States
Infantry |

|
14th United States Infantry |

|
6th United States Infantry |

|
10th United States
Infantry |
 |
17th United States Infantry |
 |
7th United States Infantry |
|
|
|
|
United States Cavalry Regiments |

|
1st United States Cavalry |

|
5th United States
Cavalry |
|
|

|
2nd United States Cavalry |

|
6th United States Cavalry |
|
|
United States Artillery Batteries |

|
1stUnited States Artillery,
Batteries E and G Consolidated |

|
3rd United States Artillery,
Battery C |

|
4th United States Artillery,
Battery G |

|
1st United States Artillery,
Battery I |

|
3rd United States Artillery,
Batteries F & K Consolidated |
 |
4th United States Artillery,
Battery K |

|
1st United States Artillery,
Battery K |

|
4th United States Artillery,
Battery A |

|
5th United States Artillery,
Battery C |

|
2nd United States Artillery,
Battery A |

|
4th United States Artillery,
Battery B |

|
5th United States Artillery,
Battery D |

|
2nd United States Artillery,
Batteries B and L Consolidated |

|
4th United States Artillery,
Battery C |

|
5th United States Artillery,
Battery F |
 |
2nd United States Artillery,
Battery D |

|
4th United States Artillery,
Battery E |

|
5th United States Artillery,
Battery I |

|
2nd United States Artillery,
Battery G |

|
4th United States Artillery,
Battery F |

|
5th United States Artillery,
Battery K |

|
2nd United States Artillery,
Battery M |
|
|
|
|