Does anyone else have any anti-mage strategies that haven't been named? I'd really like to hear them, so I can properly counter them later Ah, kidding, I probably won't know what to do come battle time. Hopefully I can tag onto someone's coat-tails and rain fire and arrows down from above.
I've always viewed fireballs as arrows (that are on fire, just a little bigger). Attack mages, if possible, from a cover position, such as one in the forest. Immortal Blood pulled that on me in my first battle, and it svcked ass.
Throw missiles of any type at them. Distract them with those. Or, attack them with two separate things. Use your own mages if you have any. If you have Thu'um, use it.
Throw tar at them in barrels. Even if they shield the barrels from themselves, the barrels will break, causing tar to go all over them AND their hands, preventing them from casting spells.
Use turpentine as well. Have your men even take cover behind a wall or a trench, etc.
Those are my thoughts on the subject.
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Also, I think EVERYONE would have battlefield assassins. Battlefield assassins aren't guys in black hoods. They are mobile infantry soldiers assigned to kill the enemy general.