Great War Eastern Front

Getting Started with Great War Eastern Front

I spent about three weeks trying to get this mod working properly on my setup before I figured out what was actually going wrong. Most people hit the same wall within the first hour, so I am writing this down before I forget the specifics. It is a modification for Hearts of Iron IV that shifts the focus almost entirely to the Eastern Front of World War I. The base game covers the whole world, but this mod narrows things down so you are dealing with trench warfare, massive manpower pools, and the logistical nightmare of supply lines stretching across Polish flatlands and Russian steppes. You play through roughly 1914 to 1918, and the mechanics around combat width, supply consumption, and attrition are completely rebalanced compared to vanilla. The download is available through the Steam Workshop. Search for "Great War Eastern Front" and make sure you are grabbing the version tagged for the current game patch. I used to just click subscribe and walk away, but that approach caused me a real problem last year when the game updated and my entire save file broke because I had subscribed to an outdated build. Now I check the workshop page comments first, and I always note the date of the last update before subscribing. If the last update was more than two months ago and the game has patched since then, you are asking for trouble.

Installation and Load Order

Here is where most people mess up. You cannot just drop the mod into your mods folder and expect it to work. The launcher in the bottom right corner of the main menu is where you need to focus. Enable the mod, and then make absolutely sure it sits at the very top of your load order. Everything else needs to go below it. If you have any other mods installed, their hierarchy matters a lot here because this mod rewrites a significant chunk of the core Eastern Front logic, and if another mod loads after it, your changes will get overridden silently. No error message. Your game will just run with the wrong data. I had this happen to me once with a terrain overhaul mod. My battles looked normal but the supply routes were completely broken. Took me six hours to trace it back to a load order issue. After that, I started using a simple rule: all map and terrain mods go below Great War Eastern Front, and everything else goes below those. It is not perfect but it stopped the silent overrides for me.

Playing the Mod

The campaign mode puts you in control of either the Central Powers or the Entente on the Eastern Front. The AI handles the broader strategic decisions poorly, so you will mostly be managing divisions yourself. The combat system works differently here. You are dealing with much wider combat widths than the vanilla game expects, which means bunching your divisions into larger formations pays off. A standard infantry division with support artillery and engineers holds a frontage of about eight kilometers, so plan your attacks around that number. Trying to push narrower formations through this terrain will eat through your organization and supply way faster than you expect. One thing the game does not tell you clearly is how supply depots interact with the terrain tags. In the eastern provinces, the terrain defaults to jungle and marsh even though historically this was farmland and forest. The mod applies these terrain tags, which double your supply consumption in those areas. I learned this the hard way during a 1915 offensive where my entire army group ran out of supply within forty-eight hours despite having more than enough trucks on paper. The workaround was building supply hubs directly in the provinces you are fighting through instead of relying on distant regional centers. Each hub costs about twelve hundred construction points but it cuts supply loss from the terrain penalty by roughly sixty percent. That single change turned a losing offensive into a manageable stalemate.

Common Problems and Fixes

Game crashes on startup: This usually means you have a conflict between this mod and another one that changes unit models or division templates. Disable your other mods one at a time until the game launches. The crash is almost always traceable to a mod that modifies the same files. Division templates look wrong: The mod includes its own templates, but they sometimes fail to populate correctly if you are running on a lower-end system. Go into the military interface and rebuild your templates manually. Start with a basic infantry composition of one infantry battalion, one artillery support company, and one engineer company. Do not add too many support units because the supply system in this mod punishes over-organization heavily. AI refuses to launch offensives: The AI under this mod tends to be overly cautious about supply lines. If you are playing as the Central Powers, you may find yourself stuck in a defensive posture for months. The workaround is to focus your production on rail capacity in your home territories first, then build forward supply hubs before you attempt any major pushes. The AI calculates offensive potential based on supply capacity, and if that number looks low, it will sit and wait indefinitely.

Save file bloat: This mod tracks individual supply flow per province, which means saves get large quickly. A typical six-month campaign save can reach around two hundred megabytes. I compress my saves monthly and delete the old ones. Keeping too many saved games in the same folder also slows down the load times significantly. I keep maybe five to six saves max at any point, and I use the autosave feature with a longer interval so I am not generating dozens of files.

Performance Notes

The mod is heavier than vanilla. Expect frame rates to drop by about thirty to forty percent in large battles with fifty divisions on screen. Turning off map events and reducing the parallax effect in the graphics settings helps a noticeable amount. I usually set the graphic quality to medium and keep the map zoom level at the default. Going higher on detail does not improve gameplay, it just burns more GPU time for no real benefit. If you are running this on integrated graphics or an older laptop, you might want to consider lowering the battle animation speed to slow. It does not affect the math, only the visual rendering, and it can cut your CPU load during big engagements by a meaningful margin.

When This Mod Is Not for You

The Great War Eastern Front does not cover the Western Front in any meaningful detail. If you want to play campaigns in France or Belgium, this is not the right tool. The mod also assumes you have a reasonable grasp of Hearts of Iron IV basics. There is a learning curve around the supply system, and if you have never managed logistics in a grand strategy game before, the first few months will feel punishing. I would suggest running a vanilla game first just to get comfortable with supply hubs and combat width before jumping into this. It makes the transition much smoother and saves you from quitting out of frustration. There are also known issues with certain DLC combinations. If you have the Man the Guns DLC installed, it does not interfere with anything in this mod. But if you have La Resistance or By Blood Alone, you may experience script errors during the 1916 events. I have not tested every possible combination, so I cannot guarantee compatibility there. The safest bet is to run the mod with only the base game and no extra DLC active. If you want something more focused on naval warfare or a different time period entirely, you should look into other projects in the community. This mod is narrowly scoped, and that is its strength but also its limitation. It does exactly what it says and nothing else. For anyone who wants a detailed, supply-heavy Eastern Front experience in WWI, it is currently one of the better options available. Just make sure your load order is correct and your supply hubs are built before you start attacking.