How had Arnold played a key role in the northern campaigns?

Benedict Arnold played a crucial role in the northern campaigns of the American Revolutionary War, particularly during the pivotal battles of Saratoga in 1777. His leadership and audacious tactics significantly contributed to the American victory, helping to secure French support for the revolutionary cause. Despite his later defection to the British, Arnold's strategic acumen and bravery in the northern campaigns solidified his reputation as one of the war's key figures. His actions not only influenced the outcome of specific battles but also shifted the momentum in favor of the American forces.