but, to quote some powers on the site...
and the buildings list:Light the Beacons
Allows troop summoning from the Beacons
Built along the hilltops of the White Mountains, the Beacons of Gondor are lighted in times of war to summon aid from its many provinces and allies. Once set ablaze, these great pyres can be seen from as far away as Anfalas and Pinnath Gelin, and a massive call to arms within the entire kingdoms of Gondor and Rohan ensues. It is only a matter of when, not if, the Men of the Outlands will arrive.
Beacon of Gondor
Summons reinforcements
Great fire-places filled with woodpiles and oil and permanently manned by men of Gondor, the Warning beacons act as the kingdom’s alarm system in dire times. The most well-known of these: Amon Dîn, Eilenach, Nardol, Erelas, Min-Rimmon, Calenhad and Halifirien were built in the Third Age to warn the Southern Fiefs of Gondor for a threat in the north provinces of Calenardhon and Anorien or conversely. In the case of the War of the Ring, the beacons are used by Gondor to summon aid from the southern provinces and at emergencies, the closely-allied kingdom of Rohan, further confirmed with the arrival of the Red Arrow.
Anyways, I could've just posted this...
Muster the Fiefdoms
Summons reinforcements from Southern Gondor
A truly vast kingdom stretching almost the entirety of the lands south of the Ered Nimrais to the Anduin, Gondor is the greatest of the free realms of Men west of Middle-earth. Asides Minas Tirith and Anorien, Gondor comprises of a number of autonomous fiefdoms paying allegiance to the Lord of the White Tower. These are Lossarnach, Lebennin, Lamedon, Belfalas and Anfalas. Separate realms also existed within the Fiefs including the Morthond Vale, Pinnath Gelin, Pelargir and Dol Amroth. With the lighting of the Beacons, the southern provinces of Gondor will send companies of soldiers to support the defenses of Minas Tirith against the enemy forces. While all warriors of the Fiefdoms rally under the banner of Gondor, each Fief’s military is distinctive, possessing its own traits, specialties and appearance. Renowned for their heroism and loyalty among the Fiefs are the soldiery of the Blackroot Vale and Arnach, Morthond and Lossarnach.
hope that answers your question...
@glorf:
1) Well, whatever that means.... I'm sure Ents will be weak against Fire arrows
2) GotST.... well, from the descriptions on the site, I do belive that they won't be purchaceable from anything else than Celeborn... but that's what I think, I don't know for sure