Calenhad - a Beacon of Gondor is one of the Middle Earth Fortress Series, a source book for ICEs Middle Earth Role Playing Game (MERP).
Calenhad is the sixth beacon, counting East to West, in a chain of beacons that would warn Minas Arnor (Minas Tirith) of an attack from the North.
This source book includes a very detailed description and layout of the Calenhas Fortress. Calenhad - A Beacon of Gondor, also includes a detailed description of the area, garrisons through history, and advice on running campaigns set in or around Calenhad. The suggested adventures cover periods from the Second Age through to the Fourth Age.