Meade commanded the Army of the Potomac.
George G. Meade
General George Meade
The Union was the North at the Battle of Gettysburg. The Army of the Potomac was the army on the field.
Meade
MEADE
Major General Alfred Pleasonton commanded the Union's cavalry corps at the Battle of Gettysburg. His cavalry commanders helped to win the Battle of Gettysburg for the Union.
Gettysburg was the place, not the opposing army.
The Battle of Gettysburg Place where the battle was fought: Gettysburg, Pennsylvania.
The Union.
The union won that battle.
The North (those againt slavery) were the Union throughout the Civil War, and including during the Battle of Gettysburg.
The leader was Abraham Lincoln.