Who was involved in the trench war?

Trench warfare primarily involved soldiers from the Allied Powers, including France, the United Kingdom, and Russia, against the Central Powers, primarily Germany and Austria-Hungary, during World War I. This type of warfare was characterized by the construction of extensive networks of trenches on the Western Front, leading to a stalemate and horrific living conditions for the troops involved. The battles often saw high casualties due to the deadly combination of modern weaponry and the static nature of trench combat.