Within a little over a year, it was estimated that as many as 10,000 volunteers received training in his camps. Nearly half of them came from bin Ladin's native Saudi Arabia. Others came from Algeria, Egypt, and some other Muslim countries such as Yemen, Pakistan and Sudan.
The war in Afghanistan had led to the major stand-offs between the two superpowers, the United States and the Soviet Union. The United States favored Osama bin Ladin at that time, and America's Central Intelligence Agency put 500 million-per-year campaign to arm and train bin Ladin's Mujahedin guerrillas to fight the Soviet Union. After ten years of savage fighting, the Mujahedin were able to fight the Soviet troops out of Afghanistan. The departing of Soviet troops left behind the Afghanistan with well-organized and equipped modern army from a variety o