By July 1863, the artillery of the Army of the Potomac had evolved into a large and powerful force. It was well trained, well equipped and well led by Brigadier General Henry J. Hunt. Like all large military organizations, however, the Army's artillery was a complex organism made up of many subordinate units, each with different experiences and abilities. In the first days of July 1863 as the Union and Confederate armies converged on Gettysburg, Pennsylvania, it was ultimately the performance of individual batteries that determined the success of the Union Artillery.