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The town is on a small stream coming out of the mountain-pass, and is backed by a range of hills of moderate elevation. To the north, between the city and Walnut Springs, stretches an extensive plain. On this plain, and entirely outside of the last houses of the city, stood a strong fort, enclosed on all sides, to which our army gave the name of "Black Fort." Its guns commanded the approaches to the city to the full extent of their range. There were two detached spurs of hills or mountains to the north and northwest of the city, which were also fortified. On one of these stood the Bishop's Palace. The road to Saltillo leaves the upper or western end of the city under the fire of the guns from these heights. The lower or eastern end was defended by two or three small detached works, armed with artillery and infantry. To the south was the mountain stream before mentioned, and back of that the range of foot-hills. The plaza in the centre of the city was the citadel, properly speaking. All the streets leading from it were swept by artillery, cannon being intrenched behind temporary parapets. The house-tops near the plaza were converted into infantry fortifications by the use of sand-bags for parapets. Such were the defences of Monterey in September, 1847. General Ampudia, with a force of certainly ten thousand men, was in command.