It’s passed down through their chain of command. There aren’t many (if any) places on earth that are so remote that they can’t be reached by radio. So national leader (or whoever is the decision maker) tells their subordinates. They tell their subordinates. And so on until everyone has been notified.
In reality, though, once the announcement is made, everyone knows. The only thing subordinate commanders need to do is decide where their soldiers will rally
Chain of command. Top leaders communicate to lower leaders who communicate to lower etc.
Nowadays it is easy because of xommunication methods but in older wars fighting could last months after war ended. American Civil war that happened.
Also, WWII had an interesting guy who fought 30 years after war ended because no communication
That depends on what time period you want to know about and how the military is organized, but in general, this information has to get passed down the chain of command the same way any other information does. In World War 1 for instance, the information was sent out giving the time that fighting would cease and often instructions to not operate beyond the front line while waiting for that time (since there was no more point sending out patrols or planes). Beyond signal communications, the word would have been carried by foot or horseback like other messages.
Particularly remote groups might not hear the orders for some time. There are a number of reports of so-called “holdouts” in World War 2, Japanese units on remote islands that were out of contact with their chain of command, did not realize the war had ended, and emerged from hiding months or even years after the war was over. This would be pretty unlikely nowadays given that, at least in organized militaries, people would normally be in wireless contact.
In today’s world with satellite communications, they get their orders over their communication systems.
In the times before radio, someone would have had to contact them in person. I’m sure someone will come along and cite the instances where battles happened after a war was declared over. It had happened many times.
That’s not likely to happen anymore, though outside of some freak instances where soldiers might lose all of their communication equipment .
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