Archaeologists believe the world's first war was in Sudan. They examined 61 skeletons that are 13,400 years old. They were initially discovered in the 1960s. For decades, scientists believed they were killed in a massacre. New research has revealed they were killed during a years-long war. The skeletons are now regarded as evidence of the earliest organized warfare. Scientists said the war was probably because of climate change.
The researchers looked into injuries on the skeletons. They said they were from arrows and spears. It is likely they happened during a series of long conflicts. Rival tribes competed for food that was in limited supply because of dramatic changes in climate. Ice covered much of the Northern Hemisphere. Flooding caused major changes to the availability of farmland. A researcher said: "People had to survive these changes, which were brutal."