A plan of campaign that contemplated the driving back of the French to the Pyrenees must, of course, embrace a good deal more than the mere reorganization of the Anglo-Portuguese army for a great push north of the Douro. There were many minor factors to be taken into consideration and utilized. First and foremost came the question as to how far the position of Generalissimo of the Spanish Armies could be turned to account. After his experiences in 1812 Wellington was determined to entrust to his Allies no crucial part of the operations, whose failure could wreck the whole scheme. With his own striking-force he intended to take only one Spanish army, that which was under the sole Spanish general whom he could trust for willing co-operation, even though he knew him to be no great military genius. Castaños had, by his influence at Cadiz, been nominated as Captain-General alike in Galicia, Castile, and Estremadura, and all the troops in those provinces now formed part of the new ‘4th Army.’ They included Morillo’s division, now cantoned about Caçeres, Carlos de España’s in the mountains between Ciudad Rodrigo and the pass of Perales, the lancers of Julian Sanchez--now counted a brigade of regular cavalry and not a _partida_--on the front between the Agueda and the Douro, and the two Galician divisions of Losada and Barcena, with their weak attendant cavalry brigade: to bring this up to strength two extra regiments[454] had filed up the Portuguese frontier during the winter from Estremadura. All these were in touch with the Anglo-Portuguese army, and were intended to move with it. They made up 18,000 foot and 3,000 horse. In addition there were many other troops theoretically belonging to the 4th Army, but at present cut off from it by the intervening zone of French occupation--viz. Porlier’s division in the Eastern Asturias, and Mendizabal’s irregular forces in Biscay and Cantabria--the troops of Longa and the Biscayan volunteers with other smaller bands. These scattered units, which could only come under Wellington’s real control when he should have beaten the French back to the Ebro, might make up 10,000 or 12,000 men. But they could not be counted upon for the first month of the campaign. In addition, Castaños had a number of immovable troops--the garrisons of Rodrigo and Badajoz, a dépôt of unhorsed cavalry in Estremadura, and a sedentary unit called the ‘Army of Reserve of Galicia,’ consisting of all the most depleted corps of the old Galician army: its six battalions only made up 2,000 men, and it stopped at Vigo or Corunna all through the year 1813. Two other Galician battalions[455] had been sent round by sea during the winter, to join the much-tried Army of Catalonia. This small transference of troops had reached the knowledge of the French in an exaggerated shape, and caused much speculation at Madrid.