If you want to break thru to the enemy and win you must destroy their shield.
So very few know what that shield is..
And I cannot tell you. May God forgive me for my cowardice.
Discussion
Historically you don't actually break the shield, rather you choke the supply chains as part of a broader psychological attack. Your aim is always to expend the least amount of energy to obtain victory and nothing comes cheaper than the enemy defeating themselves mentally.