 Deprived of the Palatinate, Frederick V had made a new alliance with the Dutch Republic.Bethlen used Ferdinand's refusal to give one of his daughters into marriage to him as a pretext to join the new coalition.Christian of Brunswick was dispatched to invade Bohemia from the north, while Bethlen attacked from the east, but Johann Tserclaes, Count of Tilly routed Brunswick in the Battle of Stadtlohn on 23 August 1623.