Henry Knox, a Boston bookseller, had, like Greene, only slight training for military command. It shows the dearth of officers to fight the highly disciplined British army that Knox, at the age of twenty-five, and fresh from commercial life, was placed in charge of the meager artillery which Washington had before Boston. It was Knox, who, with heart-breaking labor, took to the American front the guns captured at Ticonderoga. Throughout the war he did excellent service with the artillery, and Washington placed a high value upon his services. He valued too those of Daniel Morgan, an old fighter in the Indian wars, who left his farm in Virginia when war broke out, and marched his company of riflemen to join the army before Boston. He served with Arnold at the siege of Quebec, and was there taken prisoner. He was exchanged and had his due revenge when he took part in the capture of Burgoyne's army. He was now at Valley Forge. Later he had a command under Greene in the South and there, as we shall see, he won the great success of the Battle of Cowpens in January, 1781. It was the peculiar misfortune of Washington that the three men, Arnold, Lee, and Gates, who ought to have rendered him the greatest service, proved unfaithful. Benedict Arnold, next to Washington himself, was probably the most brilliant and resourceful soldier of the Revolution. Washington so trusted him that, when the dark days at Valley Forge were over, he placed him in command of the recaptured federal capital. Today the name of Arnold would rank high in the memory of a grateful country had he not fallen into the bottomless pit of treason. The same is in some measure true of Charles Lee, who was freed by the British in an exchange of prisoners and joined Washington at Valley Forge late in the spring of 1778. Lee was so clever with his pen as to be one of the reputed authors of the Letters of Junius. He had served as a British officer in the conquest of Canada, and later as major general in the army of Poland. He had a jealous and venomous temper and could never conceal the contempt of the professional soldier for civilian generals. He, too, fell into the abyss of treason. Horatio Gates, also a regular soldier, had served under Braddock and was thus at that early period a comrade of Washington. Intriguer he was, but not a traitor. It was incompetence and perhaps cowardice which brought his final ruin.