The Captured Bride (Daughters of the Mayflower, #3)

Mercy Lytton, a scout with keen eyesight raised among the Mohawks, and Elias Dubois, a condemned traitor working both sides of the conflict, must join together to get a shipment of gold safely into British hands.
A war-torn countryside is no place for a lady

Mercy Lytton is a lady like none other. Raised amongst the Mohawks, she straddles two cultures, yet each are united in one cause. . .to defeat the French. Born with a rare gift of unusually keen eyesight, she is chosen as a scout to accompany a team of men on a dangerous mission. Yet it is not her life that is threatened. It is her heart.  Condemned as a traitor, Elias Dubois faces the gallows. At the last minute, he is offered his freedom if he consents to accompany a stolen shipment of French gold to a nearby fort—but he is the one they stole it from in the first place. It turns out that the real thief is the beguiling woman, Mercy Lytton, for she steals his every waking thought. Can love survive divided loyalties in a backcountry wilderness?