Unfortunately that strength of principle and correctness of judgment which might enable him to resist the various seductions to which his fame and rank exposed him in the metropolis of the Union, were not associated with the firmness which he had displayed in the field and in the most adverse circumstances. Yielding to the temptations of a false pride and forgetting that he did not possess the resources of private fortune, he indulged in the pleasures of a sumptuous table and expensive equipage, and soon swelled his debts to an amount which it was impossible for him to discharge. Unmindful of his military character, he engaged in speculations which were unfortunate, and with the hope of immense profits took shares in privateers which were unsuccessful. His claims against the United States were great and he looked to them for the means of extricating himself from the embarrassments in which his indiscretions had involved him; but the commissioners to whom his accounts were referred for settlement had reduced them considerably, and on his appeal from their decision to Congress, a committee reported that the sum allowed by the commissioners was more than he was entitled to receive.

He was charged with various acts of extortion on the citizens of Philadelphia, and with peculating on the public funds. {3}

Not the less soured by these multiplied causes of irritation, from the reflection that they were attributable to his own follies and vices, he gave full scope to his resentments, and indulged himself in expressions of angry reproach against what he termed the ingratitude of his country, which provoked those around him, and gave great offense to Congress. Having become peculiarly odious to the government of Pennsylvania, the executive of that State (President Reed, formerly aid to Washington) exhibited formal charges against him to Congress, who directed that he should be arrested and brought before a court-martial. His trial was concluded late in January, 1779, and he was sentenced to be reprimanded by the Commander-in-Chief. This sentence was approved by Congress and carried into execution. {4}

From the time the sentence against him was approved, if not sooner, his proud unprincipled spirit revolted from the cause of his country and determined him to seek an occasion to make the objects of his resentment the victims of his vengeance.

Turning his eyes on West Point as an acquisition which would give value to treason and inflict a mortal wound on his former friends, he sought the command of that fortress for the purpose of gratifying both his avarice and his hate.

To New York the safety of West Point was peculiarly interesting, and in that State the reputation of Arnold was particularly high. To its delegation he addressed himself; and one of its members had written a letter to Washington, suggesting doubts respecting the military character of General Robert Howe, to whom its defense was then entrusted, and recommending Arnold for that service. This request was not forgotten. Some short time afterward General Schuyler mentioned to Washington a letter he had received from Arnold intimating his wish to join the army, but stating his inability, in consequence of his wounds, to perform the active duties of the field. Washington observed that, as there was a prospect of a vigorous campaign he should be gratified with the aid of General Arnold—that so soon as the operations against New York should commence, he designed to draw his whole force into the field, leaving even West Point to the care of invalids and a small garrison of militia. Recollecting, however, the former application of a member of Congress respecting this post, he added that "if, with this previous information, that situation would be more agreeable to him than a command in the field, his wishes should certainly be indulged."

This conversation being communicated to Arnold, he caught eagerly at the proposition, though without openly discovering any solicitude on the subject, and in the beginning of August (1780) repaired to camp, where he renewed the solicitations which had before been made indirectly.

At this juncture Clinton embarked on an expedition he meditated against Rhode Island, and Washington was advancing on New York. He offered Arnold the left wing of the army, which he declined under the pretexts mentioned in his letter to Schuyler.

Incapable of suspecting a man who had given such distinguished proofs of courage and patriotism, Washington was neither alarmed at his refusal to embrace so splendid an opportunity of recovering the favor of his countrymen nor at the embarrassment accompanying that refusal. Pressing the subject no further, he assented to the request which had been made and invested Arnold with the command of West Point. Previous to his soliciting this station Arnold had, in a letter to Colonel Robinson, of the British army, signified his change of principles, and his wish to restore himself to the favor of his prince by some signal proof of his repentance. This letter opened the way to a correspondence with Clinton, the immediate object of which, after obtaining the appointment he had solicited, was to concert the means of delivering the important post he commanded to the British general.

Major John André, an aide-de-camp of Clinton, and adjutant-general of the British army, was selected as the person to whom the maturing of Arnold's treason, and the arrangements for its execution should be entrusted. A correspondence was carried on between them under a mercantile disguise in the feigned names of Gustavus and Anderson; and at length, to facilitate their communications, the Vulture, sloop-of-war, moved up the North river and took a station convenient for the purpose, but not so near as to excite suspicion.