What langeuge did they speak during world war 1?

There was no single language spoken during World War 1. The war involved many countries from all over the world, each with their own languages.

Here are some examples:

* Allied Powers: English, French, Russian, Italian, Serbian, Romanian, Portuguese, etc.

* Central Powers: German, Hungarian, Turkish, Bulgarian, etc.

Soldiers would often communicate with each other in a mix of languages, using interpreters or relying on gestures and basic phrases.

It's important to remember that the war was a complex and global event involving diverse populations with different linguistic backgrounds.