During the first Christmas of WWI,

soldiers crossed trenches to exchange seasonal greetings and talk. … to mingle and exchange food and souvenirs. There were joint burial ceremonies and prisoner swaps, while several meetings ended in carol-singing. Men played games of football with one another, … Fighting continued in some sectors, while in others the sides settled on little more than arrangements to recover bodies. (more)

I just saw the 2005 movie Joyeux Noel on this. The movie itself, and all the reviews I could find, saw these events as a heart-warming story, of heroic soldiers resisting an evil military leadership:

Their castigators are elders who arrive to restore the bellicosity almost as a matter of tradition. (more)

[The movie] invents the notion that the men who took part in the event were subsequently punished. … But there’s no official evidence that such a thing happened, though subsequently the generals learned to rotate soldiers away from a specific section of trench. (more)

But the real military leaders did work to prevent recurrences:

It was never repeated—future attempts at holiday ceasefires were quashed by officers’ threats of disciplinary action (more)

commander of the British II Corps issued orders forbidding friendly communication with the opposing German troops. Adolf Hitler, then a young corporal of the 16th Bavarian Reserve Infantry, was also an opponent of the truce. …

The events of the truce were not reported for a week, in an unofficial press embargo which was eventually broken by The New York Times, published in the then-neutral United States, on 31 December. The British papers quickly followed. … The tone of the reporting was strongly positive, with the Times endorsing the “lack of malice” felt by both sides and the Mirror regretting that the “absurdity and the tragedy” would begin again. …

Coverage in Germany was more muted, with some newspapers strongly criticising those who had taken part … In France, … greater level of press censorship … press was eventually forced to respond to the growing rumours by reprinting a government notice that fraternising with the enemy constituted treason. (more)

I find it disturbing that viewers and reviewers aren’t more torn about this. No hesitation or reservations whatsoever expressed. Even though this is depicted in the movie as leading to soldiers deserting and spying on enemy arrangements.

Sure, if all soldiers would always refuse to fight wars, wars would not be possible, and that might be for the better, I’m not sure. But as long as war remains possible, national governments will want to control armies who can protect the nation against hostile armies. They won’t want armies who can decide to start or stop wars whenever they feel like it; they will want armies who accept a chain of command with the government at the top.

Sure, maybe we want soldiers and commanders at various levels to have the freedom to refuse to follow some limited set of commands to commit atrocities. As long as such freedoms are still consistent with our armies defending us from hostile armies. But we simply can’t just let any soldier or commander agree to a local peace any time and place they choose. Just as we can’t let them quit or switch sides anytime they choose. Or sell military equipment or supplies, or rape and pillage any accessible locals, or start new wars with new rivals.

The idea of armies that we control who defend us against hostile armies just isn’t consistent with very high levels of local discretion. Sure, the idea of armies is consistent with some modest levels of local control, and there are some borderline questions about how much discretion is desirable. But wholesale local negotiations of local truces, purposely hidden from commanding officers, surely that at least risks moving into dangerous territory. And an ordinary movie viewer who liked the idea of having armies to protect them from hostile armies should feel at least some wariness about this prospect, and some sympathy for the awkward positions in which such actions place commanding officers.

There’s a chain of command in the army for a reason. A good reason. Even at Christmas in the trenches.