Insurrection of the Spaniards and Portuguese—Their Alliance with England—Battle of Riosecco—Joseph enters Madrid—First Siege of Zaragossa—Dupont's March into Andalusia—The Battle of Baylen—Dupont Surrenders—Joseph quits Madrid—Situation of Junot—Arrival of Sir Arthur Wellesley—Battle of Roriça—Battle of Vimiero—Convention of Cintra. 275