The Warwick Line (also known as the Warwick–Yorktown line) was a defensive works across the Virginia Peninsula maintained along the Warwick River by Confederate General John B. Magruder against much larger Union forces under General George B. McClellan during the

American Civil War The American Civil War (April 12, 1861 – May 26, 1865; also known by other names) was a civil war in the United States. It was fought between the Union ("the North") and the Confederacy ("the South"), the latter formed by state ...

in 1861–62. The main line extended 12 miles from Yorktown to the Warwick River and downstream to Lee's Mill, then westward to Skiffe's Creek, which flowed into the James River at Mulberry Island, where the line was anchored on the east by a four-gun battery at Mulberry Island Point. The south end of Mulberry Island (now part of Fort Eustis) is located at the confluence of the Warwick and James Rivers.

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