What is history: it is the echo of the past to the future, the reflection of the future on the past. - Hugo
We'll see something like this in some historical fiction or historical drama movies – the "no-war card." Usually such a scene: in the war, the enemy scolds under the city, and our army still ignores it and continues to blow the wind, and then hangs up the "no-battle card", the enemy cannot do anything, even sits and scolds for several days, and some of them will rub their fists and slap their hands in unbearable insults. This is the same convention.
But this is just to add to the drama. I think this is very simple, do not produce a free card to deal with them, the enemy can also be another way, such as siege, siege, war, is not an effective military action or strategy, so the "free card" has no practical significance.
If the "no-war card" is a useful thing, historically as long as you don't want to fight, you can hang up the no-war card, you can't do anything with the other side. Sounds like this, but is it realistic? You think others are fools of you, and it's ridiculous to hang up a free war card and not fight. So the free card doesn't have a big impact.
In those cases where it is necessary to hang up the exemption card, basically both sides already have a preliminary winner, and the initial victory of the superior party will not give up the opportunity to actively eliminate the battle card.
For example, the attackers surrounded the city. There are clear advantages. At this time, can hanging the free battle card delay time? The attackers had to hurry up the siege, after all, "Kennedy's troops were under the city and would change for a long time."
If the free war card really forbids the role of war. Its role in the history of the War of Annihilation. A weak side as long as it does not hang up the free card to maintain a permanent peace?
In short, what war history is not necessarily the absolute absence of a "no-war card" or similar no-war card, but it is certainly an uncommon tactic.
There is a saying in Sun Tzu's Art of War: "Soldiers, devious ways also." War is not a conventional card, whether in ancient times or modern times, it is an honest "war-free card", and if there is no strategy in it, it is superfluous. Isn't it.