The mill is a long stone structure, one story high and several hundred feet in length.

At the period of which I speak General Scott supposed a portion of the mill to be used as a foundry for the casting of guns.

This, however, proved to be a mistake.

It was valuable to the Mexicans because of the quantity of grain it contained.

The building is flat roofed, and a line of sand-bags over the outer walls rendered the top quite a formidable defence for infantry.