The Killer Angels
The book depicts the three days of the Battle of Gettysburg during the American Civil War , and the days leading up to it: June 29 , 1863 , as the troops of both the Union and the Confederacy move into battle around the town of Gettysburg , Pennsylvania , and July 1 , July 2 , and July 3 , when the battle was fought . 
<triplet> American Civil War <subj> Union <obj> participant <subj> Confederacy <obj> participant