I'm in my first solo playthrough of this great looking game.
My question here is this:
A Crusader force was activated, moved into Tarsus and attempted a Call for Surrender. They failed with a DR that was < the RF. They have a MP left for continued movement. Could they instead decide to remain in position and immediately (i.e. in this very same activation) initiate a siege as per 17.6.1? Or can they only do that in a subsequent activation?