Trench medieval warfare

In a world that is a mix between medieval technology and world war 1 technology Two warring factions named Blue nation and Red nation are locked in a never ending trench war that has lasted decades. The two countries fight for a single resource, coffee. Which is the most valuable resource in this world as both nations love coffee and soldiers are willing to die for it. Both nations are locked in trench warfare using a mix of medieval armor and aesthetic and world war 1 era weapons and rifles