A letter vvritten by those of the assembly in Rochell: to Monsieur le Duc de Les Diguieres : Containing an admonition vnto him, to leaue the enemie, and to ayde them. As also an exhortation and a warning vnto those that forsake the trueth, and cleaue vnto the enemies thereof, to shun that vengeance which God will send downe vpon them for the same.