So many obstacles, military and political, were to be overcome before Andalusia could be invaded, 1812, that Lord Wellington finally resigned that project and meditated instead, operations against Marmont’s army. To obtain success it was essential to isolate him as much as possible, and in that view various combinations were matured; but the most important stroke was to destroy the bridge and forts at Almaraz on the Tagus. Strong in works, that place was also a great depôt for stores and boats, and not only facilitated the passage of the Tagus for reinforcements coming from Soult, but was sufficient to serve as a base and place of arms for an army to operate on the rear and flank of the British, if they engaged with Marmont in Castile. General Hill, who remained with a force in the Alemtejo, was charged with this great and dangerous enterprise, for a clear understanding of which the nature of the country must be described. The left bank of the Tagus, from Toledo to Almaraz, is lined with rugged mountains, difficult for small bodies, impracticable for an army. From Almaraz to the frontier of Portugal the banks are more open, yet still difficult, and the Tagus was only to be crossed at certain points, to which bad roads led. From Almaraz to Alcantara the bridges, both those included, were ruined, and those of Arzobispo and Talavera above Almaraz were of little value because of the rugged mountains. Soult’s pontoon equipage had been captured in Badajos, and the French could only cross the Tagus between Toledo and the frontier of Portugal by Marmont’s boat bridge at Almaraz, to secure which he had constructed three strong forts and a bridge-head. The first, called Ragusa, contained stores and provisions, and was, though not finished, exceedingly strong; it had a loopholed stone tower twenty-five feet high within, and was flanked without by a field-work near the bridge. This was on the north bank. On the south bank the bridge had a fortified head of masonry, which was again flanked by a redoubt called Fort Napoleon, placed on a height a little in advance; imperfectly constructed, however, inasmuch as a wide berm in the middle of the scarp furnished a landing-place for troops escalading. It was yet strong, because it contained a second interior defence or retrenchment, with a loopholed stone tower, a ditch, drawbridge, and palisades.