So in the agrarian era, if you need to destroy the enemy’s productive capacity, what you want to do is bum his fields, or if you’re really vicious, salt them.
Now in the information era, destroying the enemy’s productive capacity means destroying the information infrastructure.
The idea is to destroy the enemy’s productive capacity, and depending upon the economic foundation, that the productive capacity is different in each case.
But in the industrial era destroying the enemy’s productive capacity means bombing the factories which are located in the cities.
With regard to defence, the purpose of the military is to defend the nation and be prepared to do battles with its enemy.
How do you do battle with your enemy?