Engagement at Gaines's Mill, Virginia

Engagement at Gaines's Mill, Virginia - The Battle of Gaines's Mill, sometimes known as the First Battle of Cold Harbor or the Battle of Chickahominy River, took place on June 27, 1862, in Hanover County, Virginia, as the third of the Seven Days Battles of the the Peninsula Campaign. Following the inconclusive Engagement at Beaver Dam Creek, Virginia the previous day, Confederate General Robert E. Lee renews his attacks against the right flank of the Union Army, relatively isolated on the northern side of the Chickahominy River. There, Union Brigadier General Fitz John Porter's V Corps establishes a strong defensive line behind Boatswain's Swamp where they hold off disjointed Confederate attacks until dusk. The Confederates finally mount a coordinated attack and drove the Union troops from their positions here, forcing a Union retreat across the river.
== Union Troops ==
* 1st Connecticut Heavy Artillery
* 2nd Delaware Infantry
* 8th Illinois Cavalry (detachment)
* 12th Illinois CavalryNot originally referenced on unit homepage
* McClellan DragoonsNot originally referenced on Dyer summary but listed on unit homepage
* 2nd Maine Infantry
* 5th Maine Infantry
* 6th Maine InfantryNot originally referenced on Dyer summary but listed on unit homepage
* 1st Massachusetts Light Artillery Battery
* 3rd Massachusetts Light Artillery Battery
* 5th Massachusetts Light Artillery Battery
* 9th Massachusetts Infantry
* 22nd Massachusetts Infantry
** 2nd Massachusetts Sharpshooter Company
* 29th Massachusetts Infantry
* (II) 1st Michigan Infantry
* (I) 4th Michigan Infantry
* 16th Michigan Infantry
** Brady's (Independent) Sharpshooter Company (attached)
* 1st New Jersey Light Artillery Battery ("Battery A")
* (II) 1st New Jersey Infantry
* (II) 2nd New Jersey Infantry
* (II) 3rd New Jersey Infantry
* (II) 4th New Jersey Infantry
* 1st New York CavalryNot originally referenced on Dyer summary but listed on unit homepage
* 1st New York Light Artillery / Battery B
* 1st New York (Independent) Light Artillery Battalion
* 2nd New York Light Artillery BattalionNot originally referenced on Dyer summary but listed on unit homepage
* 1st New York (Independent) Light Artillery BatteryNot originally referenced on Dyer summary but listed on unit homepage
* (II) 5th New York Infantry - (NOTE: At Gaines Mill, under command of Lieutenant Colonel Hiram Duryea, the 5th faced a musketry fire which cut down one third of its men and won praises from all who witnessed its remarkable efficiency and drill while in the thickest of that fight. It was in that battle that after having received several deadly volleys it paused at one time, while still under fire, to count off anew so that its movements might not be deranged by the absence of the fallen men)
* 10th New York Infantry
* (II) 12th New York Infantry
* (II) 13th New York Infantry
* 14th New York Infantry
* 16th New York Infantry
* 18th New York Infantry
* (II) 25th New York Infantry
* 27th New York Infantry
* 31st New York Infantry
* 32nd New York Infantry
* 44th New York Infantry
* 52nd New York Infantry
* 56th New York Infantry
* 57th New York Infantry
* 63rd New York Infantry
* 64th New York Infantry
* 66th New York Infantry
* 69th New York Infantry
* 82nd New York InfantryNot originally referenced on Dyer summary but listed on unit homepage
* 88th New York Infantry
* 4th Pennsylvania Cavalry
* 6th Pennsylvania Cavalry
* 1st Pennsylvania Light Artillery / Battery A
* 1st Pennsylvania Light Artillery / Battery B
* 1st Pennsylvania Light Artillery / Battery G
* 1st Pennsylvania (Reserve) Infantry
* 2nd Pennsylvania (Reserve) Infantry
* 3rd Pennsylvania (Reserve) Infantry
* 4th Pennsylvania (Reserve) Infantry
* 5th Pennsylvania (Reserve) Infantry
* 6th Pennsylvania (Reserve) Infantry
* 7th Pennsylvania (Reserve) Infantry
* 8th Pennsylvania (Reserve) Infantry
* 9th Pennsylvania (Reserve) Infantry
* 10th Pennsylvania (Reserve) Infantry
* 11th Pennsylvania (Reserve) Infantry
* 12th Pennsylvania (Reserve) Infantry
* 13th Pennsylvania (Reserve) Infantry / Companies A/B/D/E/F
* 53rd Pennsylvania Infantry
* 62nd Pennsylvania Infantry
* 83rd Pennsylvania Infantry
* 95th Pennsylvania Infantry
* 96th Pennsylvania Infantry
* 1st Rhode Island Light Artillery / Battery CNot originally referenced on Dyer summary but listed on unit homepage
* 1st United States Cavalry
* 4th United States Cavalry
* 5th United States Cavalry
* 2nd United States Artillery / Battery A
* 2nd United States Artillery / Battery B
* 2nd United States Artillery / Battery D
* 2nd United States Artillery / Battery L
* 3rd United States Artillery / Battery L
* 3rd United States Artillery / Battery M
* 5th United States Artillery / Battery A
* 5th United States Artillery / Battery C
* 5th United States Artillery / Battery D
* 5th United States Artillery / Battery F
* 5th United States Artillery / Battery I
* 5th United States Artillery / Battery K
* 1st United States Sharpshooters
* 1st United States Engineer Battalion
* 2nd United States Infantry
* 3rd United States Infantry
* 4th United States Infantry
* 6th United States Infantry
* 8th United States InfantryNot originally referenced on Dyer summary but listed on unit homepage
* 10th United States Infantry
* 11th United States Infantry
* 12th United States Infantry
* 14th United States Infantry
* 17th United States Infantry
== Casualties ==
* Union: 894 killed, 3,107 wounded, 2,836 captured/missing = Total 6,837
== Sub-Operations ==
This operation is part of:
* March 17-September 2, 1862 - The Peninsula Campaign
** June 25-July 1, 1862 - The Seven Days Battles before Richmond, Virginia
== Notes ==
== Sources ==
* (Pages 606, 608, 618, 882, 886, 903)
* https://en.wikipedia.org/wiki/Battle_of_Gaines%27s_Mill
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