
Alexandra E. answered 03/18/19
Bachelor's in Writing and Rhetoric with Writing Tutoring Experience
The comma goes after the clause in the beginning of the sentence, in this case after "war." If you can remove part of the sentence (ie "During the Civil War") and the sentence will still make sense, separate the two halves with a comma. These are called dependent and independent clauses, and when you combine them, you always use a comma.