"But the Saudis didn't simply counter communism. They fueled a generation of zealous Islamist fighters who later caused bigger problems elsewhere. These Islamists were instrumental to the Saudis after the Soviets invaded Afghanistan in December 1979. Inspired by the strict Wahhabi interpretation of Islam and armed with Saudi funds and weapons, Arab mujahideen poured into Afghanistan. (An estimated 175,000 to 250,000 Arabs and Afghans fought there at any given time during the war, according to terrorism analyst Peter Bergen.) After a decade of guerrilla war during which the Soviets sustained heavy losses, the Red Army withdrew, and their puppet government in Kabul fell soon thereafter." (thanks Sultan)