| Battle of Gaines's Mill |
| Part of the American Civil War |
Battle of Friday on the Chickahominy
Alfred R. Waud, artist, June 27, 1862. |
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| Belligerents |
 United States (Union) |
 CSA (Confederacy) |
| Commanders and leaders |
George B. McClellan
Fitz John Porter |
Robert E. Lee |
| Strength |
| 34,214[2] |
57,018[2] |
| Casualties and losses |
| 6,837 (894 killed, 3,107 wounded, 2,836 missing or captured)[3] |
7,993 (1,483 killed, 6,402 wounded, 108 missing or captured)[3] |
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