Warfare v1 : me club, you stone. Me want your cave. Me club you

Warfare v2 : I stand in front of line of my people in front of your line. Let’s see which line win

Warfare v3 : use of camouflage. Where is the bastard

Warfare v4: use of proxies. Who is the bastard behind the bastard

Warfare v5 : novel technology. Most don’t even realise they’re at war