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
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