Well we have to recognise the differing mechanism of the RTW (and thus M2TW) campaign map...

You inherently have these options... If another coutries army stack is stomping around your province then you can "1. Give battle." by sending you army out to attack it, though this does lead to the odd mechanism were in defending you lands you become the aggressor?!?

Or you can leave you forces in the Settlement and generally ignore the trespassing army which is sort of the equivilent of "2. Prepare for seige." only in this case the siege is not automatic and you do not lose control of the province even if the siege begins.

Finally you could take one look as the invaiding army and decided you have no chance unless you consoladate you forces and withdraw your troops from the settlement and province all together leaving the invaiding army free to do whatever they like without oppostion, as in "3. Abandon the settlement.". Again the assault on the now empty settlement is not guaranteed at this point and revolt becomes a possibility to...

In princple I agree with the other posters in that it would be nice to get some immediate options at the start of a siege; immediate sally (with your troops in the settlement and their's starting near the edge of the map and if the clock runs out before you drive them off then the siege begins), lock the gates, or make a run for it abandoning the settlement as long as there is a valid route to withdraw.

I just wanted to point out that with the more dynamic nature of the campaign map now we essentially have the same options as before with more variety in possible outcomes...