A few weeks ago, I went down a rabbit hole reading about battles in the ancient world. From what I could find, the earliest (reliably) recorded battle in history is the Battle of Megiddo, fought between Pharaoh Thutmose III and the Canaanites in 1457 BC.
Based on an archaeological site in Tollense Valley, Germany, the earliest discovered large scale battle in northern Europe is believed to have occured around 1200 BC. However, as far as I know, there is no written account of this battle.
kevinwarstadt.com 
And yet you know, as long as there have been people there have been battles.
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Very true!
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