I was wondering, when you invade an empire, assuming you can't do so with enough strength to attack all targets simultaneously, which targets do you attack first?
Do you try to take out lightly defended cities in the first strike, in order to cripple the enemy economy and prevent them from building resources? Or do you go for the castles first, in order to take the toughest targets before a garrison can be prepared and in order to deprive the enemy of access to his best units?
Do you actively seek out and engage enemy field armies, in order to defeat them in detail and leave the settlement garrisons isolated, or do you bypass them in order to lay siege to the enemy settlements. If you take the second option, do you try take the city by spies or siege weapons in order to force the enemy army into an offensive siege, or do you maintain the siege in order to lure the enemy army to attempt to relieve the city, thus drawing out the garrison and allowing the city to be taken without an assault?
My own strategy used to be to go for the cities first, in order to deprive the enemy of money and isolate the castles; however, I have gradually shifted towards favouring a direct attack on the main enemy castles, especially if they are underdefended, in order to get them out of the way and prevent them training reinforcements. I tend to find that several full stacks of enemy militia causes me far less problems than one stack of knights.
As for field armies, I very much tend to favour bypassing them and laying siege, in order to try to draw out the garrison and destroy it along with the field army in a defensive battle.
The reason I ask these questions is that since I mostly play BC nowadays, I am finding that I have to pick my targets very carefully when going on the offensive: Sieges are extremely costly, and the AI will positively churn out reinforcements when it is under attack, so you really can't afford to spend 10 turns besieging some out of the way hovel; it seems to be vitally important to plan an offensive well in order not to get bogged down.
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