Hearts of Iron IV

Hearts of Iron IV

Enhanced Historical AI
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Update: Mar 28 @ 6:46am

Mod updated for 1.16.3
Improved Iraq/Iran wars in historical mode
- UK AI will place and keep some more troops in Kuwait while invading Iraq, this should decrease the chance of Iraq kicking their asses and holding on for years, preventing Countenance
- if Iraq remains fascist and at war with UK, it will try to get rid of UK resource rights
- Iran will not automatically surrender to whoever is attacking it (even if it's winning), instead it will try to fight, peace out if the war drags on, and surrender only when losing the war

- further improved AI's use of occupation laws – AI will not use just Military Governor 90% of the time, communists will use Liberated Workers more, AI will use Martial Law in states with very high resistance, Spain will not be stuck with low compliance and inability to re-core their states after SCW
- improved how Germany attacks around Maginot (should get stuck less, and advance quicker)
- fixed Nationalist Spain joining factions (usually Japan) after Axis is defeated
- German AI will protect Berlin and surrounding states much more and will pull units from elsewhere
- added some German prototype tanks into presets – Tiger (P), PzKpfw.VII Löwe, JagdPz. E-100, GW E-100
- added custom Czech airplane presets
- added custom German strategic bomber and maritime patrol plane presets and Do-335 modern heavy fighter (with correct icons, models etc.)
- Saudi Arabia will follow neutral path in historical games (no gameplay change)
- Soviet Union will claim Bessarabia properly in July 1940
- both Iraq and Iran will do the focuses to establish navy and research some ship technologies
- minor nations with very little shipbuilding capacity won't take the base strike doctrine, and prefer Trade Interdiction
- if Denmark declares independence against Germany, the Allies will try to help it and not just ignore it (due to blocked naval access)
- UK will protect Gibraltar and Malta more (with garrisons) when at war

Update: Mar 20 @ 8:47am

1.16.2 update
Improved AI's use of occupation laws:
- Italy will actually use the Colonial Police where it can
- AIs will not automatically switch to 'No Garrison' law if capitulated – if they still have some manpower – this should result in much less resistance damage to Free french and dutch colonies, that previously made their territory nearly unusable for allies

Update: Mar 18 @ 10:21pm

Hotfix
- fixed a case where Germany might get stuck in Benelux and not do anything

Update: Mar 18 @ 10:22am

1.16.1 update
- German AI will stop attacking Maginot before Belgium capitulates
- German AI will stop declaring war on China and communist south american countries in historical games
- added Medium Naval bomber presets to Japan (only for player)
- tweaked conditions for Turkey choosing sides, so it's more likely to join Allies
Operation Countenance
- Allied AIs will atack Iran in historical games (1942+ , either Soviets or UK depending on their war situation)
- AIs will coordinate the attack better
- UK/Soviets will try to get control of Iraq first, before planning attack on Iran

Update: Mar 8 @ 6:19am

Mod updated for 1.16
- Liberia will always join Allies in 1944 (historical focus on)
- Portugal will not randomly cause a WW3 by attacking Soviet Union after joining allies in historical games
- Rearranged the order of AI historical United Kingdom focuses
- fixed historical Bulgarian AI 'running out of focuses' and joining Axis too early, this also fixes Bulgaria 'stealing' states someone else in Axis conquered and impeding progress (joins war only after 1.4.1941)
- major AIs will construct Research Facilities earlier and preferrably at some historical locations
- US AI will build a nuclear facility at Los Alamos (1942+)
- some minor changes to AI equipment presets (for ex: UK will research and use advanced light tanks – Valentine, also corrected the template to match Valentine)
- Japan and United Kingdom AIs will build few fuel silos to not constantly run out of fuel when their navies fight, UK will want to take the Oil prospecting decisions more
- tweaked Japanese AI aircraft production to not produce so many land fighters (and planes overall, need the factories for army)
- Japan will use mixed infantry/armor divisions
- changes and fixes to French BB presets (corrected module tier and types)
- German AI will assign more dockyards to BB construction early and at least finish the Scharnhorst BCs
- Fixed German AI becoming completely inactive at the eastern front if someone from Allies retakes Paris lategame (modified an unfortunately coded vanilla ai_strategy)
- some other bugfixes to default AI strategies
- Australia and Canada can now abandon historical path if UK completes 'Change of course' focus (unless manually set to be historical)
- China and warlords will not switch to advanced (and expensive) weapons so quick and then run out of resources, and then out of guns


Added an AI script for Germany if Sweden refuses the trade agreement and ends up at war with Germany
(which is not so uncommon):
- AI will delay operation Barbarossa for a while
- will try to rush and kill Sweden first

-Iraq will follow historical events better and the Golden Square coup will happen properly in 1941, not in 1939; Allies will rush Iraq more

Update: Jan 3 @ 7:14am

- Fixed German AI repeatedly creating new light tank variants despite no longer using them and wasting XP
- Soviet AI will take higher manpower law immediately if it has Total Mobilisation active
- English AI will stop producing so many capital ships if it loses too many screens
- AI with exiled governments will now use 'Purge Infiltrators' decision to get PP (mostly for ENG who hosts many exiled governments)
- AI will use 'expatriate donations' and 'Joint Training Execise' decisions more
- United Kingdom more likely to do Operation Catapult decision (attack on Vichy fleet)
- changed US B-17 bomber preset – separated early and later variant to enable early production, but allow a more potent airframe later
- some other minor changes and bugfixes to preferred AI tank and plane templates

Update: Dec 23, 2024 @ 8:49am

- Added custom templates for Italian aircraft + fixed wrong default 3D models
- Italy will build more airplanes and focus more on bombers
- Italy will prio hiring naval and air advisors more

- Fixed USA AI sometimes derailing historical German AI by completing War Plan Red or White after finishing its 'historical' focuses in 1943 (which disables historical path for Germany and makes it do all kinds of wacky things)
- Germany will stop attacking Ireland in historical games
- further improved Soviet AI, improved wartime production, switches to Total Mobilisation much sooner, now uses the same dynamic behavior as Germany (stops attacks if weak, be more careful in winter) - should hold on a bit longer against Germany
- larger AIs will produce some trains when at peace so they're not immediately in a deficit when a war starts

Update: Dec 16, 2024 @ 1:26am

Update 1.15.3
- Fixed some outdated refereneces in the mod (pointing at old german focuses)
- Fixed an error in my mod code that might have caused Turkey to join Allies/Axis way earlier than intended
- Minor improvements to Soviet AI
- Fixed the missing Soviet TB-3 icon (interwar large airframe)

Update: Dec 5, 2024 @ 9:56am

Update 1.15.2
- patch claims to have fixed a bug with major AIs not hiring XP advisors – but I still don't see AIs taking them, so this has been fixed in the mod
- Fixed Italy AI randomly taking the 'Claims on Turkey' Focus and declaring war on Turkey in historical games
- Fixed UK airforce just sitting on british isles and not doing anything useful (happens since 1.15) – pushed AI to again attack/bomb the occupied states in France, Benelux and northwest Germany (USA as well)
- Minor tweaks to AI production and PP spending (Germany and Soviet Union)
- Added custom division templates for AI Finland – smaller and will use the unique finnish support companies (this should help them fill the long front better)
- Made many AI nations use the correct name_lists for their divisions
- Axis nations will not station troops in Bulgaria when trying to attack Greece through it in historical games (because Bulgaria AI refuses to join any war until 1.4.1941 and blocks their armies)
- fixed or removed some outdated AI strategies from the mod, some of my US improvements weren't working with NSB DLC apparently

Soviet Union
- removed some old mod strategies and fixed some bugs that made AI train less infantry units than desired and be too weak vs Germany
- AI will build more tanks and stop swapping factories so much, should result in a more consistent armor production, AI now regularly has a few thousands of T-34s in 1942-43
- added an early IL-2 CAS template
- AI should not stomp Finland so hard in the Continuation War and instead keep the tanks aimed against Germany
- also will stop doing instant day 1 naval invasions against Finland and other Axis countries (USSR should be 'surprised' by the attack after all)
- AI will produce cheaper infantry-only divisions if it's losing
- AI will protect Leningrad better

Germany
- added a late garrison template containing armored cars, the AI will use it later in the game
- will use Anechoic tiles on its submarines and will use cruiser submarine

USA
- fixed some wrong AI weights in naval templates that were causing the AI to not produce any modern BBs or carriers for a very long time

Update: Nov 29, 2024 @ 12:40pm

- Boosted AI research of paratroopers and marines, now that the AIs uses them more
- reduced the AI research weight for new Gottedamerung techs, because AI doesn't use almost any of them

Germany
- Added back many improvements to German AI from the previous version of mod
- Added an alternative historical strategy for Germany – if it kills USSR in historical game, it will follow a different plan and focus more on naval things and defeating UK.
- German AI will actually use subs in the Atlantic, and not just along their own coast
- will build nuclear research facility in the endgame (if it still lives)

USSR
- if it loses its airforce it will reinforce a bit first, before engaging with Germany again