The gunship hovers close to the village, just outside of rifle range - that being all the village would have to defend itself. The soldiers look for the two long roofs, and put a rocket into each. The church building and the school - they want to deprive the village of education as well as Christianity, because education is power.
The oil is in the south, but is pumped to the Muslim north, and the money for the oil pays for the helicopters and aeroplanes, which were used to impose the will of the north on the south.
Over a million people had died before Darfur.