Quote Originally Posted by DVX BELLORVM
Yes, it ended as soon as I grabbed it.

It is an exploit, since you can defeat a much stronger army by rushing to their siege equipment and grabbing it. But since the AI usually brings a lot of siege equipment, it would be almost impossible to take advantage of it.
Not necessarily. The enemy is limited in siege equipment to the amount of infantry present on the field. You would just need one cheap infantry unit per piece of siege equipment, rush out when they get close, and quickly grab them in the middle of the melee to force and end to the battle.

Heck, if you choose to continue, the enemy will all be leaving the mapp and you could unleash your cavalry to mow down the stragglers on their way out...