
Originally Posted by
Homeros
First of all, the enemy does not attack a strong army and least of all one that is guarding a bridge. The AI only attacks with massive numbers or when it can hit you from both sides. The only way to invite them to attack you is to use a very small force. Your archers and siege equipment will run out of ammo quite fast when you're up against multiple stacks. They are not sufficient to break the enemy (commanded by a good general).
Second, whenever I've used two or three spear units to block the bridge, they were simply overrun by the enemy (especially heavy cavalry, they just march through killing half my unit without significant casualties).
Third, you lose the advantage of flanking completely. Which is arguably the most effective and fastest way to break the enemy. What I'm doing is basically the same thing Hanibal did fighting the Romans at Cannae - compress the enemy into a small area and attack them from all sides. It doesn't even matter what units you have, almost all enemy armies break the moment they are charged.
A general and one or two other cavalry units (HA are sufficient, it's the enemy morale I'm attacking, I'm not looking for a prolonged melee) are critical to any army. You'll need some cavalry to chase routers and/or take out siege equipment anyway.
I prefer to attack the enemy in the field - that's more fun than defending a bridge or sieges imho. But when I use a bridge, it's defensively. The army guarding the bridge is designed to deal with the enemy in the most cost effective way possible.
There are two major advantages when defending a bridge. The enemy has to cross the bridge making them vulnerable to missile fire, and the enemy has no room to maneuver. Those are two different things. What I'm doing is making the most out of the maneuvering part without sacrificing the other part (you make it sound like I'm not using missiles and/or cheap units, but fight with a fully fledged field army - which I'm not).
We're talking about Venice. Say I have to defend the bridge, I would use something like 2 spears, 4 archers/c-bows, one or two cavalry militia, and a general (perhaps a mangonel or two if available, but that requires a WC member to recruit - all other units are cheap militia which can be trained everywhere). That's half a stack of cheap and disposable units that can handle almost everything fast and easy. Not so bad me thinks. If I have to remove two units, the spears are out. Archers are usually enough to charge the enemy (form 3 sides for max morale penalties), hold for a brief moment to allow your general to circle around and hit them from behind).