I submit that the Cherry Valley massacre in the American Revolution points out that civilians were long involved in military operations. You can also look at the French and Indian war, where Indians with French officers raided colonial settlements, and in response Rangers went north to raid Indian villages.
I qualified that with wars with “Civilized” oppponenents. One of the reasons the white indian conflictys were so horrible was the lack of either side following the military conventions of the day.
But it was mutual. Google Gnadenhutten