"Through a media broadcast, the Pakistani government announced in late April 2009 that it would fight the Taliban in the Swat Valley. This led to a humanitarian crisis. The United Nations Commissioner for Refugees announced that between 150,000 to 200,000 civilians had fled the war zone. The Pakistani military took back multiple Taliban strongholds, such as Rama Kandhao ridge in Matta and a Taliban headquarters in Loenamal. On the 8th of May, the Pakistani military announced that around 80 Taliban fighters had been killed and two Pakistani soldiers had been injured. Air strikes, artillery bombardment and rocket attacks by helicopter gunships are being undertaken extensively. As of 11th May, the military spokesperson of the ISPR report that as many as 200 militants had been killed in the fighting with Pakistan Army troops, also that Pakistan helibourne commandos had been inserted in the area which is the main stronghold of these militants. By early June 2009, most of Swat was freed from Taliban and Mingora, the main town of Swat, was in complete government control."
---from Wikipedia, linked above.