edge of the city, overlooking the river, ran a stone wall four feet thick, with embrasures for guns, and banquettes for infantry. Upon the west was an isolated hill, called Loma de Independencia, towering up to a height of seven hundred feet, and sloping towards the town on the east, but presenting a steep and almost perpendicular acclivity on the west. On the summit of this hill was a gun-battery, with a breastwork of sand-bags, and about midway of the slope a strongly fortified structure, called the Bishop's palace, with outworks of masonry, containing two or three guns mounted in barbette. About six hundred yards south of the hill of Independence, and on the opposite side of the Arroyo San Juan, between the two gorges of the Saltillo road, was Federacion hill, with strong batteries on its crest, and the Soldada fort on the same height, but retired about six hundred yards from the batteries. This hill not only commanded the hill of Independence. but guarded all the approaches to the town in that quarter. The city itself was one continued fortification. The plazas and streets were barricaded and defended by artillery. Breastworks were thrown up in every direction. The walls of the cemetery on the west side of the town, the sides of the houses, the parapets on the house-tops, and even the garden walls, were pierced with crénelés and loop-holes for musketry; and wherever the firm mason-work was deemed insufficient; sand-bags were provided for the protection of those behind them. The cathedral in the main plaza Was the principal magazine for the ammunition. Months had been spent in completing these defences; forty-two pieces of artillery were planted in different quarters of the town; and General Ampudia had with him about 7,000 regular troops, and two or three thousand
