Attempting to turn West Point over to the Brits may have had something to do with that.
I was down in Wiliamsburg a couple of weeks ago, and got to see Benedict Arnold close up as he dressed down the arrogant and stubborn Colonials:
It was great! He was shouting at us and I could see spittle coming from his lips, his face was turning red, an his horse was slavering as though it had run a long distance without rest (Don't know what THAT was about)
The only thing missing was the whiz of a musketball that slapped him in his chest...:)
Yes, Arnold tried to do that for interesting reasons.
If you should visit West Point, visit their museum. There's a small corner dedicated to the decisive battle at Lexington and Arnold's action in that battle.
The American General in charge was typical British, sitting on a hilltop overlookng the battle field ... watching over Arnold who was under orders to stay on that hilltop. Arnold, however, on his horse, was witnessing the rout of American forces down below; so he jumped his horse over a fence and rode in to lead American men in a charge on the British headquarters -- he was a fighting leader, the men knew that and loved him for it, and they won that battle in a bloody way ... Arnold's blood included ... Arnold refused to have his leg amputated and limped forever after ... while continuously being screwed over financially by American politicians ... the lousy types. So he changed sides.
You'll find Arnold's story in Kenneth Roberts books: "Arundel" and "Rabble in Arms."