Organized at erie and mustered into united states service september 8, 1861. The unit was to see exclusive service in the eastern theatre.Battles: siege of yorktown, hanover court house, seven days, mechanicsville, gaines mill, savage station, turkey bridge or malvern, malvern hill, pope’s northern virginia campaign, 2nd bull run, maryland campaign. Antietam, sharpsburg, shepherdstown ford, fredericksburg, mud march, chancellorsville, gettysburg (pa.) campaign. Middleburg, upperville, gettysburg, mine run campaign, rapidan campaign, wilderness, laurel hill, spotsylvania, north anna river, jericho ford, cold harbour, bethesda church, siege of petersburg weldon railroad, peeble’s farm, poplar springs church, boydton plank road, hatcher’s run, warren’s expedition, dabney’s mills, hatcher’s run, appomattox campaign, white oak road, five forks, appomattox court house. There are four flags associated with the unit; they like other regimental and state flags adopt the standard type issued to pennsylvanian units in the war. The last issue of flags to this unit would be unique, in that they would never see active service.The national flag bears many battle honours in gold stencil as well as regimental designation. The regimental flag conforms to the pattern associated with the state of pennsylvania. The regimental flag for this pennsylvania unit has a dark blue field with the state seal in the centre of the observe. On the reserve of the regimental flags the national arms. Regimental designations were painted gold and placed in a red scroll under the state seal and national arms. The original flags of the 83rd infantry regiment are held in the civil war flag collection at the state museum in harrisburg, pennsylvania.