The only passes that were systematically employed during the war were those which lie close to the water at each end of the Pyrenean chain. At the eastern end there are three which lead from Roussillon into Catalonia. One hugs the water’s edge, and crawls along under the cliffs from Perpignan to Rosas: this was not in 1808 the most important of the three, though it is the one by which the railway passes to-day. Inland there are two other roads over difficult crests--one ten, the other forty miles from the shore--the former from Bellegarde to Figueras, the other from Mont-Louis to Puycerda and Vich. The first was the pass most used in the war, being less exposed than the Rosas route to English descents from the sea: the coast road could actually be cannonaded by warships at some corners. It was blocked indeed by the fortress of Figueras, but that stronghold was only in Spanish hands for a very short period of the war. The inmost, or Mont-Louis-Puycerda road was bad, led into nothing more than a few upland valleys, and was very little employed by the French. It would have been of importance had it led down into the lowlands of Aragon, but after taking a long turn in the hills it harks back towards the Catalan coast, and joins the other two roads near Gerona--a fortress which is so placed as practically to command every possible access into Eastern Spain. Taking all three of these paths into Catalonia together, they do but form a sort of back door into the Iberian Peninsula. They only communicate with the narrow eastern coast-strip from Barcelona to Valencia. There is no direct access from them into Castile, the heart of the country, and only a roundabout entrance by Lerida into Aragon. The great mass of the Catalan and Valencian Sierras bars them out from the main bulk of the Spanish realm. Catalonia and Valencia, wealthy and in parts fertile as they are, are but its back premises.