On This Date In History

On October 5, 1775, General George Washington writes to the president of the Continental Congress, John Hancock, to inform him that a letter from Dr. Benjamin Church, surgeon general of the Continental Army, to Lieutenant General Sir Thomas Gage, British commander in chief for North America, had been intercepted. Washington wrote, “I have now a painful tho’ a Necessary Duty to perform respecting Doctor Church, Director General of the Hospital.”
Washington described how a coded letter to a British officer, Major Crane, came into Washington’s possession by a convoluted route from “a Woman who was kept by Doctor Church.” Washington “immediately secured the Woman, but for a long time she was proof against every threat and perswasion[sic] to discover the Author, however at length she was brought to a confession and named Doctor Church. I then immediately secured him and all his papers.”
The woman Washington interrogated was the mistress of Dr. Benjamin Church, a renowned Boston physician, who was active in the Massachusetts Committee of Safety and served as a member of the Provincial Congress. In July 1775, Washington had named Church the first surgeon general of the Continental Army, only to find out three months later that he had been spying for the British since 1772. Church faced an army court martial on October 4, 1775.
Despite Church’s plea of innocence, and the inconsequential nature of the information he provided to Crane, the contents of the letter included Church’s statement of allegiance to the British crown. He was charged with treason, convicted and sentenced to life in prison. After becoming ill while incarcerated, Dr. Church was exiled to the West Indies. The ship in which he traveled is believed to have been lost at sea.
On November 7, 1775, shortly after the conviction of Dr. Church, the Continental Congress added a mandate for the death penalty as punishment for acts of espionage to the “articles of war.”

You can read one of Dr. Churches encoded letters of July 3, 1775 and the translation at this link:
https://www.intelligence.gov/evolution-of-espionage/revolutionary-war/british-espionage/benjamin-church