May 22: Pakistani Army soldiers guard a post on top of a defense position on a former base of Taliban militants overlooking the Swat Valley, at Banai Baba Ziarat area, northwest of Pakistan's capital Islamabad, Pakistan. Troops are encircling Taliban militants in their mountain base as well as the main town in the Swat Valley, as the U.N. appealed for $543 million to ease the suffering of nearly 2 million refugees from the fighting.