 Pakistan militarily intervened in Afghanistan, deploying battalions and regiments of its Frontier Corps and Army against the United Front.Al Qaeda supported the Taliban with thousands of imported fighters from Pakistan, Arab countries, and Central Asia.Ahmad Shah Massoud (for the United Front and the Islamic State of Afghanistan), Mullah Mohammad Omar (for the Taliban) and Osama Bin Laden together with Ayman al-Zawahiri (for Al-Qaeda and different Arab interests) were the main leaders of the war residing in Afghanistan.