Kaltura Share to Google Classroom June 16, 1862. The battle begins in the pre-dawn hours. The Union miscalculates the fierce defense rendered by Confederate cannon fire and becomes mired in Mother Nature’s secret weapon. Grades: 6 7 8 9 10 11 12 Subjects: Social StudiesU.S. HistoryAmerican Civil WarS.C. HistorySouth Carolina's Role in the Civil WarThe Battlefield Collection: Wars & ConflictsAmerican Civil War (1861-1865) Series: Planter at the Gate