HOI4 Field Manual
An HOI4 reference mined directly from the game files (v1.19.2.0) — 3231 defines constants across 28 sections. Not the wiki's stale numbers.
Game version: Operation Postern v1.19.2.0.3eb1 (85f4) · extracted 2026-09-06
Warfare
- Land warfare — Divisions, combat width, entrenchment, planning, and the attrition that grinds down organisation over a long front.
- Air warfare — Air superiority, close air support, strategic bombing, and the agility/detection math that decides who holds a region’s… Guide: Air-superiority
- Naval warfare — Screening, hit profiles, detection, and convoy raiding — the mechanics that decide whether a battle line survives conta…
- Logistics & supply — Railways, supply hubs, trucks, and the flow math that decides whether an offensive can actually be fed once it outruns…
Nation & economy
- Industry & production — Factory efficiency, the switching-penalty curve, buildings, and the trade and market systems that feed raw production c… Guide: Production
- Research & special projects — Research slots, tech cost, the ahead-of-time penalty, and the special project system for one-off national programs.
- Politics & diplomacy — Political power, national focus, factions, world tension, and the wargoal system that ties diplomacy to the path to war.
- Intelligence & operations — Intel networks, decryption, operatives, and the covert-operation raids that feed or deny an enemy’s decision-making. Guide: Intelligence
- Occupation & resistance — Resistance and compliance in occupied states, garrison suppression, and what letting resistance run costs an occupier. Guide: Resistance
Reference
- Game core & AI — Global game constants — the map scale, campaign dates, and the AI weight factors that don’t belong under a single warfa…
- Defines reference — 28 sections, 3231 constants, raw — every value in
common/defines/00_defines.lua. - Technology tree — 552 research technologies across 13 tech-tree folders.
- Equipment catalog — 47 equipment archetypes, 261 variants.