Camera icon.This link bypasses navigation taking you directly to the contents of this page.

How to Use the Images


Inquiry Question

Historical Context



Drawing 1
& Photo 1


Table of

Visual Evidence

Drawing 2: San Cristóbal.
[Drawing 2] with link to higher quality drawing.
(Historic American Building Survey, National Park Service)

Photo 2: Aerial view of San Cristóbal. [Photo 2] with link to higher quality photo.
(National Park Service)

San Cristóbal illustrates a principle known as "defense in depth," in which each part of a fort supports, and is supported by, one or more other parts. This system means that even if an enemy breaks through an outer barrier, there are higher and stronger sections that the defenders can use to drive out the attackers.

Questions for Drawing 2 & Photo 2

1. Refer to the paragraphs on San Cristóbal in Reading 2. Which of the elements mentioned there—the city wall, the cavalier, the moat, the plaza de armas and the hornwork—can you label on Drawing 2?

2. How do the Santiago ravelin, the Trinidad counterguard, the great moat, and the hornwork illustrate "defense in depth"?

* The images on this screen have a resolution of 72 dots per inch (dpi), and therefore will print poorly. You can obtain a high quality version of Drawing 2 and Photo 2, but be aware that each file will take as much as 60 seconds to load with a 28.8K modem.



Comments or Questions

National Park Service arrowhead with link to NPS website.