Historical clue formulations

• Civil War battle site — 2016-07-08
• 1862 invasion battle site — 2011-07-10
• Maryland's historic ___ Creek — 2010-11-05
• Bloody battleground for Lee — 2007-05-18
• 1862 battle site — 1999-03-27
• 1862 Maryland battle site — 1997-04-15
• Site of a Gen. McClellan victory — 1996-08-01