Statistics for occurrence #1 of “aide de camp Chatham” in chapter 34 of George Bancroft, History of the United States from the Discovery of the American Continent, Vol. 7, 4th edition.:

...e part in sending stores to America, and after some delay, threw up his employment. Lord Chatham was the real conqueror of Canada for England; and Carleton had been proud to take to Quebec as his aide de camp Chatham 's eldest son. But it was impossible for the offspring of the elder Pitt to draw his sword against the Americans; and his resignation was offered, as soon as it could be done without a wound to his ch...
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