
Originally Posted by
CountMRVHS
I use forts as a backup, to block choke points when my defending army suffers a loss, and to give the AI a target other than my cities.
I use them mostly in an rp sense - so I never really build them as a "barbaric" faction. But for RK/Adun. and other "defensive" factions, I like to have them.
Usually, I'll plant a fort right behind a river crossing, and put a defending army on the bridge (this is the basic idea when I defend the Poros - the fort, when I'm playing as RK/Adun., goes just north of the bridge). When the AI attacks my army, my fort troops (I usually just leave a single junk unit in there) appear as reinforcements, but more importantly, if I lose, the fort is still there, and the AI generally can't just blitz through my territory. It gives me more time to get troops & kick the AI back out.
Another example of fort building when I play the RK is at the gap in the White Mountains between Gondor and Dunland. I put a fort in that pass to prevent Dunland from coming south and wreaking havoc with my interior cities, which are usually too weak to face a big Dunland stack. Again, I'll put a defensive army just north of the fort, so the AI will have to attack the army first.
Note that I basically use forts in places where I know I won't be invading/attacking for some time. In other words, I'll plug the gaps in some parts of the kingdom, and focus on expanding in others. Eventually, I'll invade Harad or Dunland or whatever, and the fort will lose some of its relevance.
Another nice feature of forts that I really want to believe is that they supposedly decrease the occurrence of rebels in the province. Again, that probably doesn't apply to fourth age, but it's nice to think so.
But the AI will sometimes attack forts even when it doesn't have to. For example, playing as Adunabar, one way to distract Rhun from attacking your cities in eastern Mordor is to set up a fort in the area, preferably one that is reachable in one turn from one of those cities. Just leave a crappy unit in the fort, keep your main army in the city, and when Rhun sieges the fort, attack them if you feel strong enough. If you don't feel strong enough, at least they're besieging a fort rather than your valuable city - I hate being besieged, as it cuts down your income and prevents you from training.
So I basically think of forts as a kind of insurance.
I never fight in forts if I can help it. If I have to defend a fort from assault, it usually means something has gone wrong - but again, at least it slows down the AI and lets me retrain & get troops to counter the threat.