A startling new history of the largest and most famous battle in Irish history, this book incorporates findings of a series of newly discovered sources. Was the Boyne really as important as William of Orange’s propagandists claimed, or was it, as the losers—the French and many of the Irish—insisted, “only a skirmish”? Pádraig Lenihan reconciles the political potency of the Boyne with its military indecisiveness, challenging the conventional view of this most controversial event.