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Consider it like the siege of a enemy stronghold city.
First, surround and isolate / cut off supply lines etc. (done)
Second, Shell the city. Not every shell is intended to be a direct hit/kill. The psychological effect of being under constant threat is crushing. If you think it is hard to wait on the outside of the city, imagine the pressure on the inside taking fire. After a time all inside will have shell shock greatly reducing their ability to fend off the final attack. (in progress)
Third, take the city and mop up. (soon)