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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 in 1861–62.
Confederate Major General John B. Magruder's extensive defensives beginning at Lee's Mill and extending to Yorktown along the Warwick River caused the Union Army of the Potomac Commander Major General George B. McClellan to initiate a month-long siege of the Warwick-Yorktown Line which lasted until May 3, 1862 and contributed to the eventual failure of McClellan's campaign.