Which historic site served as a significant Union supply depot during the Civil War in West Virginia?

Harpers Ferry played a crucial role as a Union supply depot during the Civil War due to its strategic location. Situated at the confluence of the Potomac and Shenandoah Rivers, it served as a key transportation and communication hub. The site was important for moving troops and supplies, making it a focal point for the Union's logistical efforts in the region.

Additionally, Harpers Ferry was home to the U.S. Armory and Arsenal, which was significant for manufacturing weapons and munitions, further enhancing its value to the Union cause. Control of this location was sought after by both Union and Confederate forces throughout the war, highlighting its importance in the overall military strategy during that period.

The other locations, such as Charleston, Parkersburg, and Morgantown, while significant in their own right, did not serve the same level of operational importance for the Union's supply chain as Harpers Ferry did during the Civil War.