On what countries' history is the game based ?
Russian Empire

Put anything you want to be immediately visible on your jam page here:
Really accurate history game.
The Osowiec Fortress (located in northeastern Poland) was a Russian garrison during the First World War.
The battle, which took place on August 6, 1915, was called "Attack of the Dead" due to the fact that the defenders had a terrifying appearance (they coughed up blood heavily, after severe chemical burns of the lungs; they were wrapped in bloody rags). Before the start of the battle, the German command waited for the correct wind direction and used poison gas. Basic gas control measures have proven ineffective, as have personal protective equipment.
After waiting for the time and considering that the garrison of the fortress was killed, the Germans moved to the attack. When the German soldiers approached the forward fortifications, the remaining soldiers rose in a counterattack. The effect of surprise and a terrible look plunged into horror the enemy, who fled, not accepting the battle.

Credit the makers of any assets you used below:
gun https://sketchfab.com/3d-models/mosins-carbine-1938-99cbe39fccfd45cab54675b2fdf157c3
rails https://www.turbosquid.com/ru/3d-models/rail-track-lwo-free/739341
bridge https://www.turbosquid.com/ru/3d-models/free-ponte-anakonda-3d-model/669792
wire https://www.turbosquid.com/ru/3d-models/prison-barbed-max-free/688146
trenches https://www.turbosquid.com/ru/3d-models/trench-war-3d-1225813
village borders https://www.turbosquid.com/ru/3d-models/vilage-props-pack-fbx-free/1034760
house https://www.turbosquid.com/ru/3d-models/barn-3ds-free/418742
man https://www.cgtrader.com/free-3d-print-models/miniatures/figurines/german-soldier-ww2
grass for camouflage net https://free3d.com/3d-model/money-plant--42272.html
tree https://free3d.com/3d-model/tree-oak-v9-29481.html
grass https://www.unrealengine.com/marketplace/en-US/product/fe0a7c01da854223bda935f111aab4f4