My Bonny Light Horseman by L.A. Meyer

Jacky Faber continues her misadventures in book six of the Bloody Jack series. Sixteen isn’t so sweet for Jacky when she’s trapped into becoming a spy for the British Crown. Separated, yet again, from her true love, Jacky first finds herself in a tutu and then back in man’s clothing as a soldier in Napoleon’s Grand Army. It’s a test of loyalties for Jacky: betray the men she’s leading or the country of her birth (which honestly hasn’t been that good to her). Recommended for high school.