In 1980, brezhnev sent in soviet troops to assist communist government threatend by rebels in?

In 1980, Brezhnev sent in Soviet troops to assist the communist government in Afghanistan which was threatened by rebels. The Soviets fought a war in Afghanistan from then until they departed in 1989 after facing heavy casualties and damage from the Afghan rebels, most notably the Mujahideen. 

It was a combination of conquests and alliances