sentences:  Greatly outnumbered forces on the Peninsula initially under Major General John Bankhead Magruder delayed the advance through tactics which included elaborate ruses and physical barriers such as the Warwick Line (anchored by Mulberry Island and Yorktown), and the much less substantial Williamsburg Line.During the Battle of Williamsburg on May 5, 1862, nearly 41,000 Federals and 32,000 Confederates were engaged.Confederate casualties, including the cavalry skirmishing on May 4, were 1,682.