Publisher Paradox Interactive has announced that Hearts of Iron 4’s Thunder at our Gates Theater Pack, the final DLC included in the grand strategy game’s Expansion Pass 2 bundle, is now aiming for a June 11 release date.
Focusing on Asia and the South Pacific, the DLC adds new content for Australia alongside focus trees for Siam and the Dutch East Indies.
Hearts of Iron 4: Thunder at our Gates Launches in June
In addition, the DLC also brings with it ship captains that further expand the options available when tackling naval gameplay alongside army headquarters that allow us to deploy generals to the field, enabling them to boost the power of nearby troops but also putting them at risk of being captured.
Below, you’ll find the full list of features included in the Hearts of Iron 4: Thunder at our Gates Theater Pack when it releases, as detailed by the publisher.
- New Australian Content:
- Balance the domestic needs of a nation still reeling from the Great Depression against the demands of a British alliance still valued by much of the population.
- Influence the course of elections to deal with current priorities.
- Navigate treacherous political waters following the Canberra Air Disaster.
- Face the challenges presented by a small and scattered population while at war.
- Develop Australia’s rich natural resources.
- Follow alternate historical paths of Australia First nationalism or anti-war Communism.
- New Siamese Focus Tree:
- Balance or choose between civilian and military domination of the government, pushing for constitutional safeguards or a military coup.
- Industrialize Siam, expanding national teak and rubber reserves while developing road and rail infrastructure.
- Submit to foreign domination, saving strength for a later date, or resist the imperial powers.
- Prospect for new resources to fuel your developing nation.
- Conquer your neighbors and embrace the traditional path of the old Rattanakosin Kingdom of your ancestors.
- New Dutch East Indian Content:
- Develop a wartime economy based on rich and valuable rubber and oil reserves to overcome your lack of factories.
- Pursue autonomy from the Netherlands following the Soetardjo Petition or stay loyal to the Dutch crown.
- Explore special military focus trees to demonstrate co-operation between Dutch and East Indian forces.
- If Occupied, take advantage of Japanese decline and seize the initiative to pursue revolution and independence.
- Ship Captains: Divisional commanders are now available for the naval game in the form of Ship Captains. Award them medals to improve their performance, and promote them to Admirals to lead your fleets to victory.
- Army Headquarters. Deploy Generals to the field to greatly enhance the performance of nearby units, but with the risk of capture in the field. Imprisoned generals can be liberated through a new Raid option.
Hearts of Iron IV’s Thunder at our Gates DLC will be accompanied by a free update available to all owners of the base game, which introduces the regimental support feature that offers new ways to attach support units to divisions, and more.
Hearts of Iron IV: Thunder at our Gates releases on June 11, 2026. It will be available both individually, for the price of $19.99/£16.75 /€19.99 or your regional equivalent, and as part of the Expansion Pass 2 bundle.
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