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A new study has led archaeologists to [belief / believe] that the world's first war was in Sudan. Researchers from France and the UK have re-examined 61 [human / humane] skeletons from a site at Jebel Sahaba in the Nile Valley in Northern Sudan. The skeletons are 13,400 years old and were uncovered [in / on] the 1960s. For [decadence / decades] , scientists believed the millennia-old humans were killed [on / in] a one-off massacre. New research on injuries [sustained / suspended] by the early humans revealed [that / what] they were killed during a longer war that took place over [sever / several] years. The skeletons are now regarded [has / as] evidence of the earliest example of organized warfare between humans. Furthermore, the war was probably [triggered / gunned] by climate change.

The researchers [conducive / conducted] a deeper investigation [onto / into] injuries on the skeletons found at Jebel Sahaba. The scientists said the injuries were as [a / to] result of weapons such [was / as] arrows and spears. They were likely sustained during a series of conflicts or battles [over / under] several decades. The researchers believe conflicts arose as [revel / rival] tribes competed for food and water that were [at / in] limited supply because of dramatic changes [in / on] climate 11,000 to 20,000 years ago. At this time, ice covered a lot of the Northern Hemisphere. This caused flooding and major changes to the [available / availability] of farmland. A researcher said: "These changes were not gradual at all. People had to survive these changes, which were [brutal / brutally] ."