"A Pontoon Bridge on the James River (U.S. Civil War)" This historical event refers to the construction and use of a pontoon bridge during the American Civil War, specifically on the James River in Virginia. The bridge was constructed by Union forces under the command of General George B. McClellan, between April 24 and May 15, 1862, as part of the Peninsula Campaign. Pontoon bridges are temporary structures built using inflatable floating platforms called pontons, connected by ropes, chains, or wooden planks. They were essential for military operations, allowing troops and supplies to cross rivers without having to build permanent structures. The pontoon bridge on the James River was significant because it enabled Union forces to move from the Virginia Peninsula to the Confederate-held city of Richmond, though they ultimately failed in their attempt to capture the city. The construction of this bridge was a testament to the engineering skills and logistical capabilities of both Union and Confederate forces during the Civil War.