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Hearts of Iron IV
Hearts of Iron IV
1.19.1|Jun 17, 2026
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Thunder at our Gates | Patch 1.19.1

3/5 Moderate

Major fixes for the 'Force Attack' exploit and mod compatibility alongside significant balance reworks for Australia, Indonesia, and Siam.

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Key Changes

  • 1Fixed 'Force Attack' exploit and mod country selection screen compatibility
  • 2Australia focus tree overhaul: reduced focus lengths and increased autonomy gains
  • 3Indonesia industrialization requirements significantly reduced for multiple focuses
  • 4Siam tank research bonuses rebalanced and new regional development decisions added
  • 5New Shift+Click shortcut for automatic Commander HQ deployment
  • 6Blockade Runner admiral trait requirement reduced from 37 to 32 knots
  • 7AI lend-lease behavior now accounts for available convoy counts
  • 8Philippines gains Sergio Osmena as a leader option post-Quezon
  • 9Grand Assault 'Forward Command Posts' supply reduction nerfed to -0.01
  • 10Fixed a crash related to dynamic countries and Army HQ templates

All Changes

🇦🇺Factions: Australia(12)

  • buffAustralia: Focus length reduced from 70 to 35 days for several focuses
  • buffAustralia: Democratic branch autonomy gain increased from 0.1 to 0.3
  • buffAustralia: Fascist autonomy gain increased from 0.1 to 0.3
  • nerfAustralia: Toned down tech rushing capability through 'Lee-Enfield No.1 Mk III*' and 'Owen Gun' focuses
  • nerfGovernor General: 'Governor General' Advisor Trait Democracy drift reduced from 0.10 to 0.05
  • buffGovernor General: 'Governor General' Advisor Trait added -5% consumer goods factor
  • buffAustralia: Added Military Factories to fascist focuses 'Walls Like Uluru' and 'Crush the Gates'
  • buffCoastwatchers: 'Coastwatchers' focus now reduces Air Wing Experience Loss When Killed
  • buffNaval Auxiliary Patrol: 'Naval Auxiliary Patrol' focus now reduces Casualties on Sink
  • changeAustralia: Rebalanced various population growth modifiers
  • changeAustralia: Decision 'Call On Fascist' now has a dynamic cost
  • buffAustralia: Australian Communists no longer deal with the Cabinet Trust after the Canberra Air Disaster

🇮🇩Factions: Indonesia & Netherlands(6)

  • buffIndonesia: Significantly reduced factories required for 'The Industrialized Colony' focus
  • buffIndonesia: Significantly reduced factories required for 'The Soetardjo Act' focus
  • buffThe Republic of Indonesia: 'The Republic of Indonesia' focus now checks total factory count instead of specific types and requires fewer total factories
  • changeEconomic Integration: 'Economic Integration' focus now requires 50 factories of any type instead of 45 civilian factories
  • buffIndonesia: Militia unit upgrades now increase the success chance of Indonesian raids
  • newIndonesia: Added events that trigger after finishing a militia base decision

🇹🇭Factions: Siam(8)

  • buffSiam: Increased probability that asking for return of territories goes in Siam's favor
  • changeGerman Tank Studies: 'German Tank Studies' now grants +5% piercing bonus instead of -10% build cost
  • nerfAmerican Tank Studies: 'American Tank Studies' removed -5% build cost reduction; attack bonus remains
  • nerfUnconventional Tank Construction: 'Unconventional Tank Construction' cost reduction reduced from -20% to -15%
  • buffUnconventional Tank Construction: 'Unconventional Tank Construction' reliability penalty improved from -15% to -10%
  • newSiam: Added decisions to Develop Northern Malaya and Eastern Burma
  • buffTriangular Defense network: 'Triangular Defense network' now grants +10% Compliance boost to occupied territory
  • buffSiam: 'Recover Indochina' and 'Demand the return of lost territory' are no longer mutually exclusive

⚙️Gameplay Systems(7)

  • fixForce Attack: Fixed an exploit regarding the 'Force Attack' mechanic
  • newCommanders: Shift + Clicking a Commander while assigning to an Army now automatically deploys them with an HQ
  • buffBlockade Runner: Blockade Runner admiral trait requirement reduced from 37 to 32 knots
  • nerfForward Command Posts: Grand Assault 'Forward Command Posts' supply reduction reduced from -0.05 to -0.01
  • buffABDACOM: ABDACOM focuses reduced to 35 days (excluding first and last)
  • newPhilippines: Added Sergio Osmena as a country leader option for Philippines after Manuel Quezon's death
  • newCommanders: Allow queuing the HQ deployment of en-route Commanders

🤖AI Behavior(3)

  • fixAI: AI will now consider available convoys before making lend-lease offers
  • changeAI: Australian AI rebalanced to focus more on air power
  • changeAI: Indonesian AI encouraged to switch leaders after 'A Democratic Indonesia' focus

🐞Bug Fixes(10)

  • fixUI: Fixed country selection screen being broken in several mods
  • fixStability: Fixed a crash where dynamic countries created without valid Army HQ templates
  • fixCommanders: Fixed a bug where deployed Generals could be deployed as Field Marshals
  • fixCommanders: Fixed Command Ability cost being determined by divisions instead of battalions
  • fixSudetenland Crisis: Fixed issue where Czech puppets would trigger the Sudetenland Crisis
  • fixSpecial Forces: Fixed Special Forces doctrines showing to players without relevant DLC
  • fixAustralia: Fixed Australia not being able to end civil wars as Communist
  • fixSiam: Fixed Siam getting a wargoal against itself when asking for Indochina
  • fixIndonesia: Fixed Indonesia being able to use democratic elections after forming the Netherlands-Indonesia Union
  • fixAustralia: Fixed rail connection from Canberra to Alice Springs not completing properly

Summary

Patch 1.19.1 focuses on critical stability and exploit fixes while delivering a substantial balance pass for several nations. The update addresses a major exploit involving the 'Force Attack' mechanic and restores functionality to the country selection screen in various mods.

Faction Overhauls

Australia, Indonesia, and Siam receive the most attention. Australia's focus tree has been streamlined with shorter completion times and increased autonomy gains, while Indonesia's industrial requirements have been significantly lowered to improve early-game viability. Siam sees a rebalance of its tank research bonuses and new decisions for regional development.

Quality of Life & AI

A new Shift+Click shortcut allows for faster Commander deployment with HQs. The AI has also been tuned to better manage lend-lease offers based on convoy availability and to prioritize air power when playing as Australia.

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