Mr. Rogers Who Was A British Soldier

Among the Letters Received By the Adjutant General, 1805 - 1821, was a letter to Secretary of War Henry Dearborn from William Rogers (and also one to President James Madison), who had served in the British military, and wanted an appointment in the U.S. Military in 1811.  His siblings lived in the United States and he had married a Quaker woman.

Harrisburgh, Pennsylvania  30 April 1811

Source

"Being in London in 1797 I entered into the British Military Service in a Battalion of Infantry...".