The Doctor and The First Doctor in “Twice Upon a Time”

I adjusted the time frame, only by a couple of hours. Any other day, it wouldn't make any difference, but this is Christmas 1914... A human miracle is about to happen. The Christmas Armistice. It never happened again, any war, anywhere. But for one day, one Christmas, a very long time ago... everyone just put down their weapons... and started to sing. Everybody just stopped. Everyone... was just kind.

You've saved him!

Both of them. Never hurts, a couple fewer dead people on the battlefield.

So, that's what it means to be a Doctor of War...

You were right, you know. The universe generally fails to be a fairy tale... but that's where we come in!