Possible Clues:

• Food extremely sickly and dry, say, coming from east Pennsylvania location
• Locale for an 1863 address
• Where 3-Down's address was delivered
• City whose address includes this puzzle's title as well as 17, 20, 36, and 52 Across
• Where Lincoln delivered an address at the dedication of the Soldiers’ National Cemetery in 1863
• Battle of the American Civil War
• Meade vs. Lee, July 1863