The Battle-Summer of 1863--A Turn of the Tide--Lee's Invasion of Pennsylvania--A Threatening Crisis--Change of Union Commanders--Meade Succeeds Hooker--The Battle of Gettysburg--Lincoln's Anxiety during the Fight--The Retreat of Lee--Union Victories in the Southwest--The Capture of Vicksburg--Lincoln's Thanks to Grant--Returning Cheerfulness--Congratulations to the Country--Improved State of Feeling at the North--State Elections of 1863--The Administration Sustained--Dedication of the National Cemetery at Gettysburg--Lincoln's Address--Scenes and Incidents at the Dedication--Meeting with Old John Burns--Edward Everett's Impressions of Lincoln.