When Buna Is Evacuated the Prisoners?

In chapter 5 of Night, the camp is evacuated because the Red Army is fast approaching. Those who stayed behind in the hospital are liberated by the Russians.

What happens to the prisoners that are left at Buna after the evacuation?

I'm assuming you're referring to the evacuation of Buna. If so, those prisoners who did not evacuate were liberated by the Russians two days later. However, Elie and his father choose to leave with the officers and other healthy prisoners, & so end up at two more camps, Gleiwitz and Buchenwald.

What happened to the Buna camp in night?

Eliezer and his father were taken to Buna after staying in Auschwitz. The Buna Camp looked desolate and only had a few prisoners. The new prisoners from Auschwitz were taken through the routine showers and given new clothing. The prisoners were organized into different work...