why did the battle of gettysburg occur
The Battle of Gettysburg, which became the largest battle ever fought in the U.S., started out as a chance encounter between the Union and Confederate Forces.After his victory at Chancellorsville in Virginia, Confederate commander Lee decided to focus on invading the North in what he called the Gettysburg Campaign.oth the Confederates and the Union were aiming for a certain road junction in Gettysburg, which led to a collision of the two armies. Determined to destroy the Union army, Lee decided to immediately concentrate his forces there, while the Union also kept sending reinforcements, resulting in a three-day battle.