I've been building out a small strategy guide site as a side project, and recently spent way too much time dissecting HOI4's combat width mechanics. Thought I'd share what I learned since the game does a terrible job explaining this stuff.
The problem: most players just throw divisions at the front line and wonder why they're losing with 3x the factories.
Here's what actually matters under the hood:
- Combat width meta shifted hard after No Step Back — the old 20/40 width templates aren't optimal anymore. Plains are 90 width, forests 84, mountains 75. You want divisions that divide cleanly into those numbers to avoid stacking penalties
- Coordination stat is slept on — it determines how much your divisions focus fire instead of spreading damage. High coordination + signal companies = enemy divisions get deleted before reinforcements can cycle in
- Air superiority applies a defense penalty to enemy units (up to -35% at max), but the tooltip just says "air support" like that means something
I put together a full breakdown of combat width calculators and terrain modifiers if anyone wants the raw numbers. The site also covers naval invasion templates and spy network optimization because honestly the wiki is outdated on half this stuff.
Building this taught me that HOI4's real game is spreadsheet optimization disguised as a map painter — which is probably why I've sunk 800 hours into it and still feel like a noob sometimes.
What's the one mechanic you wish Paradox would actually explain properly in the tutorial? For me it's still naval strike targeting priority.
Top comments (0)