Aye, if it's a small garrison you can successfully besiege with anything. For instance if you have a choice of cities to attack, try besieging the one with the smallest garrison with a duff unit while you attack the other - therefore preventing any further nuisance builds.
One thing I've considered but never done is: Say you are about to declare war on Germania and it has half a dozen cities. Send in five peasants and place each near a city. Then besiege all the cities at once :) Watch while the AI armies run about like headless chickens!
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