The Germans have always enjoyed singing songs too. Groups of young German men like few things better than lustily belting out a bunch of folk tunes, patriotic and romantic ballads, pub songs, etc.

So....their songs certainly helped them carry on the war effort in both World Wars too.

What won those wars, however, was simply this: The side that had the most resources, most men, and most money eventually won...through the process of attrition.

In both wars that side was the Allies...after the USA got involved. The USA had the largest economy in the world, and it wasn't being bombed or invaded, so that economy was undamaged and operating at full capacity and it overwhelmed its economically weaker opponents. That's what won those wars.

Have we got a song about it?