How do you join?

[TacKY]

How do I join a siege fight for my faction as attacking or defending.

[Crroatian]

How do I join a siege fight for my faction as attacking or defending.

when there are crossed sword on the castle and all army's are in just like a normal battle

[kaeldragor]

Until then, you have to just hang around.

[Ringwraith #5]

Yeah, you have to wait for the sieging party to initiate an assault. It's one of the wrinkles that peeve me somewhat about sieges, you can't assault a castle that someone else is sieging, you have to wait for them to attack or leave, with the latter being more likely and significantly more annoying.
"Well boys, we've camped outside this castle for two weeks now and our allies over there have patiently waited for us to move in, so I guess it's time to pack up and clear out now."

[matt b]

Yeah, you have to wait for the sieging party to initiate an assault. It's one of the wrinkles that peeve me somewhat about sieges, you can't assault a castle that someone else is sieging, you have to wait for them to attack or leave, with the latter being more likely and significantly more annoying.

when I run into those situations I find whichever lord initiated the siege and tell him to follow me. Then I lead that Lord away from the castle/town he's sieging until the place is no longer under siege then go back and attack it myself (hopefully with the other Lord still in tow). Definitely can be annoying, but takes less time than waiting for the other guy to attack or leave.