One day, there will be a war fought that has no soldiers. More accurately — there won’t be any human soldiers.
In the same manner that drones are increasingly taking over roles that would previously require a plan with a pilot, we will eventually see humanoid robots doing the work of foot soldiers.
At that point, war will become a game of logistics and innovation. How many lumps of explosives can we produce, ship to the battlefield, and lob over to the enemy side? How many robots can we produce? How good is their software, their pattern recognition?
Essentially, every war will be a cyber war.