Civil War regiments were organized units of soldiers that fought during the American Civil War from 1861 to 1865. Each regiment typically consisted of around 1,000 men and was often formed from volunteers from a specific state or region. Regiments were designated by numbers and often named after their home state, such as the 54th Massachusetts or the 1st Texas. These regiments played a crucial role in battles and campaigns throughout the war, participating in significant events like the Battle of Gettysburg and the Siege of Vicksburg. They were composed of infantry, cavalry, and artillery units, each with distinct roles on the battlefield.