sentences:  The Confederation's Department of War, like the British, was a financial liaison with the Army; Jackson helped settle the Pennsylvania Mutiny of 1783.In October 1783, he resigned his office, and his commission, to become Robert Morris's agent in England; when he returned the next year, he studied law with the Philadelphia lawyer William Lewis.As an impoverished law student, in 1787, Jackson wrote to Washington applying for the post as secretary to the Philadelphia Convention.