United States Regiments & Batteries > Maine
The 12th Maine Volunteer Infantry Regiment lost 3 officers and 49 enlisted men killed or mortally wounded and 2 officers and 237 enlisted men to disease during the Civil War.
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1861
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| November 16 | Organized at Portland and mustered in |
| November 24 | Left State for Lowell, Mass. |
| December 30 | To Boston |
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1862
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| January 2 | Embarked on Steamer Constitution for Ship Island, Miss. |
| February 12 | Arrived Ship Island. Attached to Butler’s Expeditionary Corps. |
| March | Attached to 3rd Brigade, Dept. of the Gulf |
| May 4 | Moved to New Orleans and duty at U.S. Mint |
| June 16-20 | Expedition to Pass Manchac |
| June 17 | Pass Manchac |
| September 13-18 | Expedition to Ponchatoula (Companies C, D & F) |
| September 15 | Pouchatoula |
| October 21 | Moved to Camp Parapet |
| November 19 | Moved to Baton Rouge, La. Attached to Grover’s Division, Baton Rouge, La., Dept. Gulf |
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1863
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| January | Attached to 2nd Brigade, 4th Division, 19th Army Corps, Dept. Gulf |
| February | Attached to 1st Brigade, 2nd Division, 19th Corps, Dept. Gulf |
| March 7-27 | Operations against Port Hudson |
| April 9-May 14 | Moved to Donaldsonville. Operations in Western Louisiana |
| April 11-20 | Teche Campaign |
| April 13 | Porter’s and McWilliams’ Plantation at Indian Head |
| April 14 | Irish Bend |
| April 18 | Destruction of salt works at New Iberia |
| April 20-May 20 | Advance to the Red River |
| May 21-24 | Advance on Port Hudson |
| May 24-July 8 | Siege of Port Hudson |
| May 27 | Assault on Port Hudson |
| June 14 | Second Assault on Port Hudson |
| June 20 | Thibodeaux (Detachment) |
| July 9 | Surrender of Port Hudson |
| July 13 | Donaldsville |
| August 12 | Moved to New Orleans, then to Ship island, Miss. |
| October | At Camp Parapet |
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1864
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| January 3-7 | Expedition to Madisonville (Companies B, F, , K) |
| January 7 | Capture of Madisonville |
| March 11 | Ordered to New Orleans |
| April to June 16 | Veterans on furlough, Non-Veterans at Camp Parapet |
| May 27 | Veterans returned from Portland to New Orleans |
| June 16 | Regiment moved to Morganza, La. |
| July 3 | Moved to Algiers |
| July 13-20 | To Fort Monroe, Va. |
| July 21 | To Bermuda Hundred, Va. |
| July 21-25 | Duty in trenches. |
| July 27-29 | Demonstration on north side of James River |
| July 27-28 | Deep Bottom |
| July 31 | Moved to Washington, D.C. |
| August 2 | To Tennallytown, Md. |
| August 7-November 28 | Sheridan’s Shenandoah Valley Campaign. Attached to Army of the Shenandoah, Middle Military Division, 19th corps, 2nd Division, 1st Brigade |
| September 3-4 | Berryville |
| September 19 |
Third Battle of Winchester (Opequan) |
| September 22 |
Fisher’s Hill |
| October 19 |
Battle of Cedar Creek |
| Orcober 20 | Duty at Cedar Creek |
| November 9 | At Opequan |
| November 19 | Non-Veterans left front. Veterans consolidated to a Battalion of four Companies. |
| December 7 | Non-Veterans mustered out |
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1865
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| January | Ordered to Savannah, Ga.and attached to District of Savannah, Ga., Dept. of the South |
| February – March | Six new Companies organized for one year service and assigned as E, F, G, H, I, K. |
| March | Attached to 1st Brigade. 1st Division, 10th Army Corps, Army Ohio |
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1866
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| February – March | Companies E, F, G, H, I & K mustered out |
| April 18 | Regiment mustered out |