With the departure of Napoleon from Madrid on December 21, the offensive action of the French army in central Spain came to a stand. The Emperor had taken away with him the field army, which had been destined to deliver those blows at Lisbon and Seville that were to end the war. The troops which he had left behind him in the neighbourhood of Madrid were inadequate in numbers for any further advance, and were forced to adopt a defensive attitude. The only regions in which the invaders continued to pursue an active policy were Aragon and Catalonia, from which, on account of their remoteness, the Emperor had not withdrawn any troops for his great encircling movement against Sir John Moore. In both those provinces important operations began on the very day on which Bonaparte set out to hunt the English army: it was on December 21 that Lannes commenced the second siege of Saragossa, and that St. Cyr, after relieving Barcelona, scattered the army of Catalonia at the battle of Molins de Rey. But the campaigns of Aragon and Catalonia were both of secondary importance, when compared with the operations in central Spain. As the whole history of the war was to show, the progress of events in the valley of the lower Ebro and in the Catalan hills never exercised much influence on the affairs of Castile and Portugal. It is not, therefore, too much to assert that it was Moore’s march on Sahagun, and that march alone, which paralysed the main scheme of the Emperor for the conquest of Spain. Between December 21 and January 2 the central reserves of the French army had been hurried away to the Esla and the plains of northern Leon. It was not till the new year had come that the Emperor began to think of sending some of them back to the neighbourhood of Madrid. The 8th Corps had been incorporated with the 2nd, and sent in pursuit of Moore: the corps of Ney and the division of Lapisse were left to support Soult in his invasion of Galicia. The Imperial Guard marched back to Valladolid. Of all the troops which had been distracted to the north-west, only Dessolles’ division of the Central Reserve returned to the capital. Such a reinforcement was far from being enough to enable Joseph Bonaparte, and his military adviser Jourdan, to assume the offensive towards the valleys of the Tagus and Guadiana. The consequences of Moore’s diversion were not only far-reaching but prolonged: it was not till the middle of March that the army of the king was able to resume the attempt to march on Seville, and by that time the condition of affairs had been profoundly modified, to the advantage of the Spaniards.