ISLAMABAD ISAF commander General David H Petraeus called on Chief of Army Staff, General Ashfaq Parvez Kayani, at GHQ on Wednesday. The visiting dignitary remained with him for some time and discussed matters of professional interest. Online adds: General Petraeus assured the Pak military leadership that it would keep on supporting Pakistan besides taking it into confidence on matters of mutual interest for harmony and peace in Afghanistan. He said that without the sheer cooperation of Pakistan, US couldnt win the war against terrorism at any cost, sources said. General Petraeus highly acclaimed the services and sacrifices of armed forces of Pakistan, terming them invincible. He said we would make sure to enhance intelligence sharing network between each other so that extremism and terrorism could be eliminated tooth and nail. General also took COAS General Kayani into confidence over new operations against Taliban in various areas of North Afghanistan.