These elaborate works had been constructed in the course of a year by thousands of Portuguese labourers, directed by Colonel Fletcher of the royal engineers, upon a plan carefully thought out and laid down by Wellington himself. The first and principal chain of fortifications stretched for nearly thirty miles across the whole promontory between the river Tagus and the sea, about twenty-five miles north of Lisbon. The summits of hills were crowned with forts, their sides were escarped and protected with earthworks, their gorges were blocked with redoubts, a small river at the foot of them was made impassable by dams; in short, the utmost advantage was taken of the defences provided by nature, and these were supplemented by artificial entrenchments. Portuguese garrisons manned the greater part of the batteries, armed with guns from the arsenals of Lisbon; British troops were to occupy the most vulnerable points of attack. There was a second and third range of fortifications behind the first, in case these should be forced, but no such emergency arose. When Masséna had carefully inspected the stupendous barrier reared in front of him, his well-trained eye recognised it as impregnable: he paused for some weeks under semblance of blockading the British forces, while he was really scouring the country for the means of feeding his own; but in November he began to retreat upon Santarem, Almeida, and Ciudad Rodrigo, with a half-starved and dispirited army, greatly reduced in numbers during the campaign.[47] The year 1811 was perhaps the least interesting, yet the most critical in the history of the Peninsular war. Wellington had not escaped criticism at home for allowing Masséna to remain so long unmolested near Santarem. He described himself in a private letter, written in December, 1810, as "safe for the winter at all events". More he could not have said, knowing, as he did, that Soult was in force before Cadiz, and might at any moment join Masséna. This, in fact, he did; leaving his fields of plunder in Andalusia under the positive orders of Napoleon, he defeated the Spaniards at the Gebora on February 19, and captured Badajoz, as well as Olivenza. In his absence, Sir Thomas Graham, who commanded the British troops at Cadiz, sailed thence with La Peña, the Spanish commander, and a combined force of about 12,000 men, to make a flank march, and attack the French besiegers, under Victor, in the rear. A brisk action followed at Barrosa, in which Graham obtained a complete victory, but the Spanish troops, as usual, remained almost passive; the beaten army was not pursued, and the siege of Cadiz was not raised. This city was still the seat of the Spanish national government, but the feeble junta had been superseded by a national cortes, fairly representative of the nation, which passed some liberal measures, and dissolved the so-called regency which assumed to represent Ferdinand. [Pageheading: _FUENTES D'ONORO AND ALBUERA._]