LEWERE, Sudan — Fatima Ramadan, mother of six, froze, her eyes shooting up to the sky.

“Antonov!” she yelled.

Little girls threw down the pebbles they were playing with. Toddlers, sensing danger, started to wail. About two dozen people grabbed the young and dashed up the mountainside into a cave. It was hot and dark inside, and the children’s eyes were wide with fear.

“I don’t like this place,” said Kaka, a 10-year-old girl.

Nobody does. And yet thousands of people live like this.

As the July 9 division of Sudan nears, the government in Khartoum is scrambling to crush any rebellious chunks of the territory that will remain its own. Its forces have been relentlessly pounding the Nuba Mountains from Russian-made Antonov bombers for weeks, demanding that tens of thousands of rebel fighters dug in here disarm and drop their insistence on more autonomy for the distinctive Nuba people. Hundreds of civilians have been killed, including many children. Bombs have been dropped on huts, on farmers in the field, on girls fetching water together, slicing them in half with buckets in their hands.