On December 27, 1979, the Soviet Union invaded Afghanistan to support the communist government against insurgent forces. The invasion marked the beginning of a decade-long conflict that resulted in the deaths of thousands of soldiers and civilians. The Soviet forces faced fierce resistance from Afghan fighters, who were supported by the United States and other countries. The war had far-reaching effects, contributing to the weakening of the Soviet Union and the rise of the Mujahideen. The invasion ultimately led to the collapse of the Afghan communist government.