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.

General Taylor's force was about six thousand five hundred strong, in
three divisions, under Generals Butler, Twiggs and Worth. The troops
went into camp at Walnut Springs, while the engineer officers, under
Major Mansfield--a General in the late war--commenced their
reconnoissance. Major Mansfield found that it would be practicable to
get troops around, out of range of the Black Fort and the works on the
detached hills to the north-west of the city, to the Saltillo road.
With this road in our possession, the enemy would be cut off from
receiving further supplies, if not from all communication with the
interior. General Worth, with his division somewhat reinforced, was
given the task of gaining possession of the Saltillo road, and of
carrying the detached works outside the city, in that quarter. He
started on his march early in the afternoon of the 20th. The divisions
under Generals Butler and Twiggs were drawn up to threaten the east and
north sides of the city and the works on those fronts, in support of the
movement under General Worth. Worth's was regarded as the main attack on
Monterey, and all other operations were in support of it. His march
this day was uninterrupted; but the enemy was seen to reinforce heavily
about