This was not really "prehistory". About 100 years before the event here the battle of Kadesh [1] happened. Tens of thousands of soldiers are believed to have participated in that battle.
Not sure anyone "before the 1990s" was thinking that people were peaceful during the Bronze Age. 3200 years ago was almost to the day contemporaneous with the Trojan war [2]. That was not a time when people were peaceful and "concerned with trading and so on".
Not sure anyone "before the 1990s" was thinking that people were peaceful during the Bronze Age. 3200 years ago was almost to the day contemporaneous with the Trojan war [2]. That was not a time when people were peaceful and "concerned with trading and so on".
[1] https://en.wikipedia.org/wiki/Battle_of_Kadesh
[2] https://en.wikipedia.org/wiki/Trojan_War#Historical_basis