Ill just copy and paste what I wrote to you in the other thread.
Defendind a bridge is the easiest possible thing to defend, and the easiest way to win a battle. How you loose them I dont know, maybe you should hone your Medieval 2 Skills before playing as Gondor, because after what you described, sounds like you should completely own Mordor.
"I just lost a battle at the bridge, I had 8 archers, 2 militia, 2 fountain guard, 2 citadel spearmen, 2 gondor spearmen, 2 axemen, and a general. This game is so bugged"
Sounds like a nice little stack to defend a bridge, don't know how you lost that one...
I like to stick my Melee right at the front the bridge. I place my archers or horse archers behind them, and just pummel them orcs crossing the bridge like so:
There were 3856 Orcs in that battle alone, so eventually all my infantry died. My King and two other Rohan Rider units rushed the remaing Orcs straight on, and routed what was left of them.
End Result:
A Couple of tips... NEVER GET SCARED of the Orcs sheer numbers. Just because they may have 3x your units, they are easily broken. Playing as Rohan on VH/VH I have lost only ONE battle vs Mordor thus far (currently sieging Barad-Dur). Remember one thing when fighting Orcs, they ROUT very easily.
1) Use your cavalry wisely. They make or break the battle.
2) Attack their general's bodygaurd unit, if the enemy general is slain the Orcs will panic at any Cavalry charge and the whole army can rout like a domino affect.
3) Pause your battles and constantly re-engage your troops. Use all your units.
4) When fighting trolls dedicate 80-85% of arches on the trolls to weaken them before they get to the infantry.
5) And so important- EXECUTE all orc prisoners.