Third Brigade
| Parent Unit: First Division | II Corps | Army of the Potomac | Union Army1 | |
| Commander: | |
| Colonel Clinton D. MacDougall2 |  3 |
| Strength: | |
| ~280 officers and men PFD (June 26, 1864)4 | |
| Units:5
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| Bibliography: | |
| Siege of Petersburg Documents Which Mention This Unit: | |
| Sources: | |
- The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XL, Part 1 (Serial Number 80), pages 219-220 ↩
- The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XL, Part 1 (Serial Number 80), page 220 ↩
- Library of Congress Brady-Handy Collection, Digital ID: cwpbh 04390 ↩
- John Bryden Letter: June 26, 1864, My Dearest Sarah: “There is only 280 men left in our Brigade now after the charge. We had 4 men in our Regiment killed with one shell and 2 wounded. We have got about 30 men (fit) for duty now.” ↩
- The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XL, Part 1 (Serial Number 80), page 220 ↩