12th Connecticut Infantry Regiment The 12th Connecticut Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War . Service . The 12th Connecticut Infantry was organized at Hartford , Connecticut beginning November 19 , 1861 and mustered in for a three - year enlistment on December 3 , 1861 . The regiment was attached to 1st Brigade , Department of the Gulf , to October 1862 . Weitzel ' s Reserve Brigade , Department of the Gulf , to January 1863 . 2nd Brigade , 1st Division , XIX Corps , Department of the Gulf , to August 1863 . 3rd Brigade , 1st Division , XIX Corps , to February 1864 . 2nd Brigade , 1st Division , XIX Corps , Department of the Gulf , to July 1864 , and Army of the Shenandoah , Middle Military Division , to April 1865 . 2nd Brigade , 1st Provisional Division , Army of the Shenandoah , April 1865 . 2nd Brigade , Dwight ' s Division , Department of Washington , to June 1865 . District of Savannah , Department of the South , to August 1865 . The 12th Connecticut Infantry mustered out of service August 12 , 1865 . Detailed service . Left Connecticut for Ship Island , Miss . , February 24 , 1862 arriving there March 9 . Duty at Ship Island , Miss . , until April 15 , 1862 . Operations against Fort St . Phillip and Jackson , Mississippi River , April 15 – 28 . Occupation of New Orleans , La . , May 1 , the first regiment to land . Duty at Camp Parapet and Carrollton until October . Expedition to Lake Pontchatrain , Pass Manchac , and up Tchefuncta and Pearl rivers July 25 - August 2 . Skirmishes at Madisonville and near Covington July 27 . Operations in District of La Fourche October 24 - November 6 . Occupation of Donaldsonville October 25 . Action at Georgia Landing , near Labadieville , October 27 . Duty in District of La Fourche until February 1863 . Expedition to Bayou Teche January 13 – 15 . Action with steamer " Cotton " January 14 . Moved to Brashear City February and duty there until March . Operations against Port Hudson March 7 – 27 . Pattersonville March 28 ( detachment ) . Operations in western Louisiana April 9 - May 14 . Bayou Teche Campaign April 11 – 20 . Port Bisland , near Centreville , April 12 – 13 . Irish Bend April 14 . Opelousas April 20 . Expedition to Alexandria and Simsport May 5 – 18 . Near Cheyneyville May 18 . Movement to Bayou Sara , then to Port Hudson May 22 – 25 . Siege of Port Hudson May 25 - July 9 . Assaults on Port Hudson May 27 and June 14 . Surrender of Port Hudson July 9 . Operations in western Louisiana July to September 1863 . Sabine Pass Expedition September 4 – 11 . Teche Campaign October 3 - November 30 . Duty at New Iberia until January 1864 . Moved to New Orleans and on veteran furlough until May . Duty at Carrollton until July . Moved to Fortress Monroe , Va . , then to Washington , D . C . , July 5 – 13 . Snicker ' s Gap expedition July 14 – 23 . Sheridan ' s Shenandoah Valley Campaign , August to December . Battle of Opequan , Winchester , September 19 . Fisher ' s Hill September 22 . Battle of Cedar Creek October 19 . Duty at Winchester , Newtown , and Summit Point until April 1865 . Moved to Washington , D . C . , April 21 , and duty there until June . Grand Review of the Armies May 23 – 24 . Moved to Savannah , Ga . , June 1 – 5 and duty there until August . Casualties . The regiment lost a total of 273 men during service ; 6 officers and 65 enlisted men killed or mortally wounded , 8 officers and 196 enlisted men died of disease .