On December 24, 1979, the Soviet Union invades Afghanistan, under the pretext of upholding the Soviet-Afghan Friendship Treaty of 1978.
As midnight approached, the Soviets organized a massive military airlift into Kabul, involving an estimated 280 transport aircraft and three divisions of almost 8,500 men each. Within a few days, the Soviets had secured Kabul, deploying a special assault unit against Tajberg Palace. Elements of the Afghan army loyal to Hafizullah Amin put up a fierce, but brief resistance.
On December 27, Babrak Karmal, exiled leader of the Parcham faction of the Marxist People’s Democratic Party of Afghanistan (PDPA), was installed as Afghanistan’s new head of government, and Soviet ground forces entered Afghanistan from the north.
The Soviets, however, were met with fierce resistance when they ventured out of their strongholds into the countryside. Resistance fighters, called mujahidin, saw the Christian or atheist Soviets controlling Afghanistan as a defilement of Islam as well as of their traditional culture.