Under different circumstances, Benedict Arnold would be a celebrated figure in American History. He was one of the greatest generals of the time, having managed to capture Fort Ticonderoga, an extremely difficult endeavor, plus was key to winning the battle of Saratoga, during which he damaged his foot (thereby ending his career as a fighting soldier). It’s entirely possible that if he had continued on in this manner, he would be ranked as high as George Washington by historians, and gone on to a prominent career in politics.
Instead, he decided to switch sides for a small bit of cash. Benedict was reportedly frustrated with having been passed over for promotion by the Continental Congress, and so hatched a plot to obtain command of West Point and turn it over to the enemy. He probably would have succeeded too, if the American army hadn’t accidentally stumbled upon a British Major who was carrying papers that laid out the secret plan in detail. Benedict Arnold learned of the capture and immediately fled, and since the plot failed, only received $6,000 for his trouble.
Even worse for the former general, the British never really trusted him after he joined their side. He helped capture Fort Griswold, but they just patted him on the shoulder while keeping their hands close to their flintlock pistols. He later attempted a career at shipping after the war ended, but didn’t succeed too well, and finally retired to London in disgrace. His name would become synonymous with betrayal, though a monument would eventually be built for him in Saratoga National Park. You can still visit it to this day, and it’s dedicated to his injured foot.