On 30 August, Arnold sent a letter accepting Clinton's terms and proposing a meeting to André through yet another intermediary: William Heron, a member of the Connecticut Assembly whom he thought he could trust. In an ironic twist, Heron went into New York unaware of the significance of the letter and offered his own services to the British as a spy. He then took the letter back to Connecticut, suspicious of Arnold's actions, where he delivered it to the head of the Connecticut militia. General Parsons laid it aside, seeing a letter written as a coded business discussion. Four days later, Arnold sent a ciphered letter with similar content into New York through the services of the wife of a prisoner of war. Eventually, a meeting was set for 11 September near Dobb's Ferry. This meeting was thwarted when British gunboats in the river fired on his boat, not being informed of his impending arrival.