Badajoz, far to the south, in Spanish Estremadura, stood to the defence of Southern Portugal exactly as Ciudad Rodrigo to the defence of Northern Portugal. It possessed also in Elvas a counterpart to Almeida. But Badajoz is immensely larger and stronger than Rodrigo, just as Elvas is infinitely more formidable than Almeida. The two fortresses on the frontier of Leon are small places crowning mere mounds set in a plain. Badajoz and Elvas have towering citadels set on rugged hills, and overlooking the whole country-side. They have also strong detached forts on dominant positions: the circuit of ground that must be taken up by an army that intends to besiege them is very large, and at Badajoz there is a first-class river, the Guadiana, which cuts in two the lines which the assailant must occupy. It may be added that based on Badajoz there was a whole Spanish army of 15,000 men, not a mere division of 3,000, like that which lurked in the mountains above Rodrigo. Noting the strength of Badajoz and Elvas, the Emperor had made up his mind that they should be observed and ‘contained’ by troops from the Army of Andalusia, but not attacked till Lisbon had been conquered and the English expelled from Portugal. ‘Les Anglais une fois battus et rembarqués, Badajoz et Elvas tombent d’eux-mêmes,’ he wrote in a holograph minute addressed to Masséna, just before the advance across the Portuguese frontier began[164]. It was only when the invasion had been brought to a standstill before the lines of Torres Vedras, that he came to the conclusion that pressure must be applied south of the Tagus, to distract Wellington, and that Soult, as a preliminary to an attack on the Alemtejo, must capture Badajoz and Elvas, and disperse the Spanish Army of Estremadura. The idea came to him tardily: thanks to Wellington’s careful starvation of the main French army, Masséna was forced to retreat into Leon when Soult had only recently captured Badajoz, and had not yet shown a man in front of Elvas. The scheme was hatched, like so many of Napoleon’s Spanish plans, about three months too late for effective realization. As late as November 1810 the orders to Soult are merely to demonstrate against Badajoz, and to hinder the departure of La Romana’s army for the lines of Torres Vedras, but not to besiege the Estremaduran fortress. Probably it was Foy’s information as to the existence and strength of the unsuspected lines of Torres Vedras, which reached him late in November, that made the Emperor realize the advisability of that secondary attack by the south bank of the Tagus which Wellington had foreseen and taken means to meet a full year before. Fortunately a capable general on the defensive always knows his own weak spots long before they are discovered by the enemy. By the time that Soult had at last captured Badajoz and the small dependent places--Olivenza, Albuquerque, Campo Mayor--Wellington had got rid of Masséna from the neighbourhood of