500
Give one detail you learned about the Battle of Fort Wagner - NOT from the movie Glory - but from the Harper's Weekly article.
Sample: The Union had tried to take the fort the week earlier and failed; The 54th stormed the fort TWICE the night of the 18th; the 54th was part of a larger BRIGADE, which included regiments from CT, NY, NH, and PA; two other brigades followed after; (FYI - a brigade has 2000-4000 soldiers)