On his return to New York in June, Arnold made a variety of proposals for continuing to attack essentially economic targets in order to force the Americans to end the war. Clinton, however, was not interested in most of Arnold's aggressive ideas, but finally relented and authorized Arnold to raid the port of New London, Connecticut. On 4 September not long after the birth of his and Peggy's second son, Arnold's force of over 1,700 men raided and burned New London and captured Fort Griswold, causing damage estimated at $500,000. British casualties were high—nearly one quarter of the force was killed or wounded, a rate at which Clinton claimed he could ill afford more such victories.