on a battlefield
France and Belgium, Russia, Italy all saw heavy fighting in WWI.
In WWI, NZ was fighting for the Empire troops, and were in fact under the control of Brit commanders.
* Austria Hungarian Empire * German Empire * Ottoman Empire
france
A country can be involved in WWI without actually fighting. They can trade with only certain countries, they can send food and supplies out, and they can also raise money.
USA
fighting in trenches
United States. Instead, most of the fighting was out in Belgium and France.
It was terrible, spending all your time either in a dirty trench with rats or up on the front line fighting for your country.
through trench warfare, and in offensives it would be... barrage, over the top , slaughter.
Treaty of Versailles