From Pickens (he can't post on the forum) :
Seige Stone # 1 Spawned in the ruins behind the Black Knight Spawn.
This stone is deep enough in the ruins that we do
NOT "need" to even have aggro from the BK's.

Seige Stone # 2 Spawned in the ruins with the Hobgoblin Veteran
mob. This stone would be best to take out by either
a. Cannon Fire from a distance.
b. Strong boxes put up to block the mob out.

Seige Stone # 3 Spawned in the ruins with the Hill Giants mob.
This stone is reachable from the Mountain Ridge
without having to deal with the mob at all.

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This should be solid information to assist in the Siege. At
server down, the Siege timer was at 21 hours & 10 minutes +/-.
Any further information to better assist our Clan in this Siege,
please follow our lead & pass along information to Clan
Leadership.

[Linked Image from w3.the-kgb.com][Linked Image from w3.the-kgb.com]