Something has already been said, in an earlier volume of this work, concerning the situation of Gerona, when its two earlier sieges by Duhesme were narrated[22]. It must suffice to repeat here that the town is built on the steep down-slope of two lofty heights, with the river Oña at its foot: the stream is crossed by two bridges, but is fordable everywhere save in times of spate. Beyond it lies the suburb of the Mercadal, surrounded by fortifications which form an integral part of the defences of the city. The river Ter, coming from the west, joins the Oña at the north side of the Mercadal and washes the extreme north-western corner of the walls of the city proper. The two heights upon whose lower slopes Gerona is built are separated from each other by a deep ravine, called the Galligan, down which run an intermittent watercourse and a road, the only one by which approach to the city from the east is possible. The northern height is crowned by the strong fort of Monjuich, the most formidable part of the city defences, with its three outlying redoubts called San Narciso, San Luis and San Daniel. The crest of the southern height is covered in a similar fashion by the three forts of the Capuchins, Queen Anne, and the Constable, with the Calvary redoubt lower down the slope above the Galligan, facing San Daniel on the other side of the ravine. Two other small fortifications, the redoubts of the ‘Chapter’ and the ‘City,’ cover the path which leads down from the forts to Gerona. Neither the Monjuich nor the Capuchin heights are isolated hills; each is the end of a spur running down from the higher mountains. But while the southern summit rises high above the hilly reach which joins it to the mountain of Nuestra Señora de los Angeles, the northern summit (where lies Monjuich) is at the end of a plateau extending far to the north. The Capuchin heights, therefore, can only be attacked uphill, while Monjuich can be assailed from ground of a level little inferior to itself. But except on this point both heights are very strong, their slopes being in many places absolutely precipitous, especially towards the Galligan, and everywhere steep. Nevertheless there are winding paths leading up both, from Sarria and Pont-Mayor in the case of Monjuich, from Casa de Selva and other villages towards the east and the sea in the case of the Capuchin heights. All the ground is bare rock, with no superincumbent soil. [22] See vol. i. pp. 317-29.