One of the hardest fighting regiments in the Civil War, the First Delaware Volunteers battled in virtually every engagement with the Army of the Potomac's Second Corps from Antietam to Appomattox. One of only and handful of regiments from a slave state, the First Delaware would pay a higher price than many for the cost of restoring a broken country. The Delawareans seemed destined to always be found at the worst possible position; at the worst possible moment; on the worst of all battlefields. As if the gods of war themselves deemed that these slave state volunteers pay a larger price than others for "every drop of blood drawn by the lash." Largely forgotten in post-Civil War memory, They Fought for the Union revisits these Border State soldiers through a wealth of untapped sources, personal accounts and soldier's diaries while always placing these conflicted soldiers into the larger context of the Army of the Potomac's struggles in the Eastern theater of the war. From the original recruitment as a three-month regiment to the end of the conflict four years later, the author's candid retelling of these extra