Quote Originally Posted by QuintusSertorius View Post
Basically, yes. With reload they will no longer break off a siege. But you can fairly reliably (assuming their forces are capable of matching off with the defenders) get them to besiege a settlement on reload if you've moved a stack next to it. It has to be one bordering their existing provinces and they'd want. It's not foolproof or 100% reliable, but will often work.
I guess they couldn't solve the problem of A.I. priorities being lost, so they simply added a rule to encourage besieging after a reload.