1.19.3|Sep 17, 2026
View on Steam↗HOI IV | Patch 1.19.3
4/5 Significant
Infantry Guns now scale with Artillery tech alongside a massive rebalance of support units and new focus paths for Australia, Siam, and Indonesia.
Key Changes
- 1Infantry Guns and Rocket Batteries now scale with Artillery tech instead of Infantry Support tech
- 2Massive stat rebalance for all Artillery, Rocket Artillery, and Anti-Tank equipment tiers
- 3Significant nerfs to TD-RS and SPAA-RS (Regimental Support) armor, attack, and defense stats
- 4New 'New Guard' focus path and flavor events added for Australia
- 5New formable nations: Pan-Thai Empire (Siam) and Nusantara/Maphilindo (Indonesia)
- 6Elephantry units reworked into a Support Company with terrain and logistic bonuses
- 7Support Artillery and Rocket Artillery stat penalties increased to -50%
- 8Facility construction costs adjusted and now scale with local Infrastructure
- 9Major performance fix for supply system slowdowns when reloading save games
- 10Indonesian AI is now significantly more likely to win its revolution
All Changes
🚩National Focuses(7)
- newAustralia: Added a New Guard path for Australia
- newSiam: Added the Pan-Thai empire formable as an extension of the Greater Thai Empire
- newIndonesia: Added decisions to form Nusantara and Maphilindo
- newAustralia: Added a 6th Research Slot to the Communist path as a mutually exclusive option vs merging factions
- changeNew Zealand: Australasia formable is now available to New Zealand
- buffAustralia: Reduced focus duration to 35 days for Stretch the Fleet, Battle of the Ocean, Workers Educational Association, and Equal Pay
- buffSiam: Asian Democratic Compact now gives a flat 0.1 daily political power gain
⚔️Land Combat(11)
- changeInfantry Guns: Infantry Guns now receive benefits from Artillery tech tree improvements instead of Infantry Support Weapons
- buffArtillery Equipment I: Artillery Equipment I Soft Attack increased from 25 to 26, Defense from 10 to 11, and Breakthrough from 6 to 10
- buffArtillery Equipment II: Artillery Equipment II Breakthrough increased from 7 to 13, Hard Attack from 2 to 3, and Piercing from 5 to 7
- buffArtillery Equipment III: Artillery Equipment III Breakthrough increased from 8 to 16, Defense from 18 to 19, Hard Attack from 2 to 4, and Piercing from 5 to 9
- nerfSupport Artillery: Support Artillery and Support Rocket Artillery stat penalties increased from -40% to -50% for Attack, Defense, and Breakthrough
- nerfRegimental Support Units: TD-RS and SPAA-RS Armor Value penalty increased from -33% to -66%
- nerfRegimental Support Units: TD-RS and SPAA-RS Soft-Attack penalty increased from -33% to -66%
- changeElephantry: Elephantry converted from a normal battalion to a support company providing attack and logistic bonuses
- buffHeavy Weapons Company: Heavy Weapons Company and Motorized Heavy Weapons Company Organization increased from 20 to 30
- nerfAnti-Air Battery: Anti-Air Battery equipment requirement increased from 12 to 16 and Manpower from 120 to 180
- buffArmored Car: Armored Car Equipment IC Cost reduced across all tiers (e.g., Tier 1 from 3.5 to 3)
⚙️Gameplay Systems(6)
- buffArmy HQ: Halved supply usage for light, medium, and heavy armored HQs
- nerfArmy HQ: Added supply usage to motorized army HQ battalions
- buffFacilities: Land, Air, and Naval Facility Base Facility Cost reduced from 12000 to 10000
- nerfFacilities: Facility scaling cost increased from 5000 to 6000
- changeFacilities: Facility construction is now affected by Infrastructure levels
- changeBattalion Adjusters: Battalion Adjusters now scale with the Equipment and Manpower status of the Sub-Unit
⚓Naval Combat(4)
- nerfAnti-Aircraft Cruiser: Reduced Naval AA bonus from Anti-Aircraft Cruiser Adoption from +20% to +10%
- buffHeavy Cruiser: Added +10% Armor Bonus to Heavy Cruisers via Anti-Aircraft Cruiser Adoption
- nerfTorpedoes: Reduced Torpedo Attack bonus from Torpedo Primacy 1 from +20% to +10%
- buffDestroyers: Increased Sub Detection bonus for Hunter Killer Groups 1 from +15% to 20%
🚀Performance & Stability(3)
- fixPerformance: Improved performance for country evaluation from scope traversal in ScopedVariables
- fixSupply System: Fixed a bug where reloading a save could cause the supply system to slow down significantly
- fixMultiplayer: Fixed Out-of-Sync (OOS) issues occurring when playing in different languages
🐛Bug Fixes(4)
- fixNational Focus: Fixed an issue where the Dutch/Indonesian focus 'Fund the ML-KNIL' did not add air XP gain
- fixGenerals: Exile Generals now correctly start at level 1 with level 1 stats instead of level 3 stats
- fixArmy HQ: Fixed army HQ deployment time not properly scaling with HQ division size
- fixNetherlands: Fixed a bug where forming the Netherlands-Indonesia union would block removing De Crisisjaren
Summary
Patch 1.19.3 serves as the final 'Summer' release for the Thunder at our Gates expansion, incorporating extensive balance changes from the Open Beta. The update features a fundamental shift in how Infantry Guns and Rocket Batteries scale, moving their tech dependencies to the Artillery tree. Australia receives a new 'New Guard' path and flavor events, while Siam and Indonesia gain new formable nations and reworked unit mechanics like the Elephantry support company. Additionally, Regimental Support units (TD-RS and SPAA-RS) have seen significant stat reductions to balance their combat effectiveness.