Peace on Earth (found here) was a 1939 MGM Oneshot Cartoon, released while Europe was at the verge of World War II, directed by Hugh Harman, and considered to be his Magnum Opus. Anvilicious in its anti-war message, this short illustrates the evils of warfare through the narration of a kindly old squirrel (Mel Blanc), one of the only squirrels in his village old enough to have encountered humans. It made # 40 on The 50 Greatest Cartoons list compiled by members of the animation field, and was perhaps the first animated short by a major studio note to deal with serious subject matter. Also a source of quite a bit of nightmares, especially for those caught off guard by the cute little squirrels in the opening scenes.The short begins with a snowy panorama of the scattered relics of mankind's existence, over a chorus of "Peace on Earth " (to the tune of “Hark! The Herald Angels Sing"), which is revealed to be sung by a trio of squirrels living in a village made of discarded war materials; the most prevailing image is that of soldiers' helmets used as houses. An old squirrel greets them with a "Merry Christmas" and goes to visit his daughter and her two young children. When the children ask what one of the lyrics to "Peace on Earth" (namely "goodwill to men") means, their grandfather begins to tell them all he remembers about men. We are then shown masterly rotoscoped, nightmarish scenes of human soldiers going to war with one another, fighting over anything they could think of fighting over until the last two humans alive shoot each other. With the humans all gone, the only ones left are the furry woodland creatures, who gather in the ruins of a cathedral, and find an old "book of rules", which the humans unfortunately didn't follow. The wise owl among them reads first a few of the ten commandments (Thou Shalt Not Kill, thou shalt not steal; "Looks like a mighty good book of rules.") and then a passage which states "Ye shall rebuild the old wastes." The animals consider that a very good idea, and decide to build a civilization for themselves out of the scattered débris left by mankind. The grandfather then puts his two sleeping grandchildren to bed, seemingly glad that with the humans gone, there is now peace on Earth.In the 1950's, William Hanna and Joe Barbera remade the cartoon as Good Will to Men, updating the story with an anti-nuclear warfare message.According to one person who spoke to Hugh and Rudy at a 1980's convention, the duo were planning to make a feature-length remake of this short, but it never got off the ground.
This animated short contains examples of the following tropes: