A man of as many names as motives, Edward Bancroft is a singular figure in the history of Revolutionary America. Born in Massachusetts in 1745, Bancroft moved to England as a young man in the 1760s and began building a respectable resume as both a scientist and a man of letters. In recognition of his works in natural history, Bancroft was unanimously elected to the Royal Society, and while working to secure French aid for the American Revolution, he became a close associate of such luminaries as Benjamin Franklin, Silas Deane, and John Adams. Though lauded in his time as a staunch American...