We developed radios and other long range communications methods.
Generals have always had to balance their safety and their ability to communicate with and command armies. They rarely ever fought “side by side” they were often a decent ways back from the actual fighting. Not that fair, but rarely if ever leading a charge or something. In ancient times they might be up on a hill overlooking the battle. So they are safe from brave soul with a spear or a well aimed arrow. In the 1700s they might be a few 100 yards back in a tent, safe from bullets and mortars.
As soon as they could communicate from far away thanks to radios there’s no reason to put themselves at risk at all because they can communicate from complete safety.
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