its supply of water
from a mountain stream coming into it at or near Molino del Rey, and
runs north close to the west base of Chapultepec; thence along the
centre of a wide road, until it reaches the road running east into the
city by the Garita San Cosme; from which point the aqueduct and road
both run east to the city. The second aqueduct starts from the east
base of Chapultepec, where it is fed by a spring, and runs north-east to
the city. This aqueduct, like the other, runs in the middle of a broad
road-way, thus leaving a space on each side. The arches supporting the
aqueduct afforded protection for advancing troops as well as to those
engaged defensively. At points on the San Cosme road parapets were
thrown across, with an embrasure for a single piece of artillery in
each. At the point where both road and aqueduct turn at right angles
from north to east, there was not only one of these parapets supplied by
one gun and infantry supports, but the houses to the north of the San
Cosme road, facing south and commanding a view of the road back to
Chapultepec, were covered with infantry, protected by parapets made of
sandbags. The roads leading to garitas (the gates) San Cosme and Belen,
by which these aqueducts enter the city, were strongly intrenched.
Deep, wide ditches, filled with water, lined the sides of both roads.
Such were the defences of the City of Mexico in September, 1847, on the
routes over which General Scott entered.

Prior to the Mexican war General Scott had been very partial to General
Worth--indeed he continued so up to the close of hostilities--but, for
some reason, Worth had become estranged from his chief. Scott evidently
took this coldness somewhat to heart. He did not retaliate, however,
but on the contrary showed every disposition to appease his subordinate.
It was understood at the time that he gave Worth authority to plan and
execute the battle of Molino del Rey without dictation or interference
from any one, for the very purpose of restoring their former relations.
The effort failed, and the two generals remained ever after cold and
indifferent towards each other, if not actually hostile.

The battle of Molino del Rey was fought on the 8th of September. The
night of the 7th, Worth sent for his brigade and regimental commanders,
with their staffs, to come to his quarters to receive instructions for
the morrow. These orders contemplated a movement up to within striking
distance of t