I prefer to play a long and slow campaign with much buildings. So I keep Bordeux and Toulouse as citadels controling the advance of spaniards untill take Central Europe. So those 2 citadels repelled 1000s of spanish attacks and when the gunpowder was invented I happily built cannon towers there.
But... since I build the cannon towers they seems prety useless - they usually can't destroy a single siege machine quite unlike the ballista towers.
And yes, I man them - obviously, because it is the same attack over and over again with the same defenders.

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