On June 20, 1775, after three days of trying to determine his brother’s fate, Dr. Jack Warren, in an act of seeming desperation, headed toward British occupied Boston. In a biography of his father’s life, Dr. Edward Warren wrote, “While endeavoring, on this occasion, to pass a sentinel, in his overwhelming anxiety to ascertain his brother’s fate, Dr. [Jack] Warren received a thrust from a bayonet, the sear of …