At last, in December 1810, Macdonald had accomplished the preliminary duties which rendered it possible for him to move on Tortosa. He had revictualled Barcelona, so that it would be safe for some months from famine, and he had repaired the gap in the French lines in northern Catalonia, which had been caused by Henry O’Donnell’s daring expedition to La Bispal in the preceding September. Though the Spanish army had not been crushed, nor indeed seriously injured, it had been thrust aside for the moment: Macdonald had brought down three divisions, over 15,000 men, to Mora on the Ebro, some twenty-five miles to the north of Tortosa, and with them he was prepared to act as a covering force to the projected siege. He was strong enough to render any attempt at relief by the Catalan army impossible, for a force sufficient to beat him could not be collected by the enemy, unless they abandoned all their outlying posts; and this was practically impossible, for local feeling in the Principality was too strong to allow of the withdrawal of the smaller Spanish detachments from the various valleys and small towns which they covered. There was still the Valencian army to be considered; but Suchet considered that he could himself deal with that unfortunate and oft-defeated force; he had already proved its weakness at the series of engagements in August[291] in which he had so effectually scattered the levies of the dictator José Caro. One division would probably suffice to keep the Valencians at bay, while with two others the actual siege of Tortosa could be taken in hand. It was the Catalan army alone which had made Suchet anxious, and he was now to be relieved of all care on that side by Macdonald. [291] See vol. iii. p. 494. The preparations for the siege, it will be remembered, had long been in progress; ever since August magazines and material had been accumulating at Xerta. They had been brought down the Ebro from Mequinenza, whenever the water was high enough to allow of navigation--not without much difficulty, and occasional petty disasters when the Catalan miqueletes made a pounce upon an exposed convoy[292]. Fifty-two heavy guns were now lying ready at Xerta, with 30,000 rounds of ammunition for them, and 90,000 lb. more of powder. To set in motion the besieging army and this very large battering-train, it only required that the covering forces on each side of the Ebro should take up their positions. When Macdonald had brought up his troops to Mora, and undertaken to move them to Perello, the junction point of the two roads from Tortosa to Tarragona, nothing more remained to be settled. If the Catalan army should try to attack him it would certainly be beaten, being far too weak to face 15,000 French troops concentrated in one body. For the restraining of the Valencians, on the other side of the Ebro, General Musnier with 7,000 men was placed at Uldecona, twelve miles beyond Tortosa on the great road to the south. [292] See vol. iii. p. 503.