Catapaults, as well as other artillery units (cannon, artillery, rocket launchers) are "bombard" units. That means that they can attack, without any danger of being damaged, but they only get one shot. The same thing goes for aircraft.
Workers can be added to cities by moving the worker into the city, and clicking the "add-to-city" button on the bottom of the screen.
Hope thie helps.
Steele
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If this were a movie, there'd be a tunnel or something near here for us to escape through.....
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