- Simulation
- Strategy
Game
Combined Arms Operations Series
The Combined Arms Operations Series simulates hypothetical battles between World War II armies. Assemble your forces, out plan, and outfight your enemies to master the art of combined arms warfare in chaotic simultaneous turns where commanders must adapt quickly to an evolving battlefield.
The Combined Arms Operations Series simulates hypothetical battles between World War II armies. Assemble your forces, out plan, and outfight your enemies to master the art of combined arms warfare in chaotic simultaneous turns where commanders must adapt quickly to an evolving battlefield.
About Combined Arms Operations Series
- Released
- June 2021
- Platforms
- PC (Microsoft Windows)
Where to get it
Release, studio and platform data from IGDB. Store links go to the sellers, not to us. We do not sell games and we do not host files.
Browse everything
Sorted, filterable and paged. Every link goes to the author’s own download.
From the developers
Official announcements, newest first. Posted on Steam.
- Community AnnouncementsUpdate 1.0.9.5 - Comprehensive Update TigerUpdate 1.0.9.5 has finally arrived, and we nicknamed it Tiger because it started off big and just kept getting fatter. Tiger includes: a pair of overhauls, major system improvements to stacking and air combat, OB updates for the US, USSR, and Germany, new air squadrons across over half the OBs in the game, and much more! On the overhaul front, we have substantially revised Combat Engineering an...
- Community AnnouncementsUpdate 1.0.8.9 - Combined Content and Polish Update (Experimental)Update 1.0.8.9 is out on the experimental branch with a pair of overhauls, several other crucial improvements, and plenty of new units for Germany and the USSR in 1943! On the overhaul front, we have substantially revised Combat Engineering and totally restructured Attack Scenarios. Regarding general improvements, we have (among other things), refined air zone generation and propagation, tweake...
- Community AnnouncementsUpdate 1.0.8.7 The Grand Artillery OverhaulUpdate 1.0.8.7 has arrived! And it with it comes: a grand artillery overhaul, the German 9th Army (July 1942) OB, updates to the standard Germany 1942 OB, a brand new battlegroup naming system, and much more! Artillery Overhaul: {STEAM_CLAN_IMAGE}/39719800/555603ba7c5a574cc73c2c7e3d72a2d08aab7a2e.png The artillery overhaul is the crown jewel of Update 1.0.8.7, and its reach is felt across the e...
- Community AnnouncementsUpdate 1.0.8.2 - Combined Content and Polish UpdateUpdate 1.0.8.2 is here with a host of improvements and content additions, big and small! On the UI/immersion side, we are very keen to hear your feedback on our first pass at turn resolution and C2 visualization improvements. On the content side, we have a ton of additions to German and Soviet forces in 1941, namely a the addition of 2 full new OBs: Heeresgruppe Nord, and its Soviet adversary t...
- Community AnnouncementsDev Blog 16: Northwestern Front OB Deep Dive{STEAM_CLAN_IMAGE}/39719800/2ce21d3dd25299de3c9ca141684622657dc6bdfb.png Greetings! Today we bring you a peak into the Soviet Northwestern Front (NWF) as it stood in June/July 1941! The Northwestern Front (or Baltic Special Military District until June 24) is symbolic of the 1941 Red Army in general. It has great potential, on paper, but severely underperforms in actual combat. If properly empl...
- Community AnnouncementsDev Blog 15: Heeresgruppe Nord OB Deep Dive{STEAM_CLAN_IMAGE}/39719800/4a6028a356a1949bef702ed4d1b2e146b56a1ecf.png Greetings! Let's take a deep-dive into one of the 2 new OBs coming in update 1.0.8.2: Heersgruppe Nord as it stood at the start of Operation Barbarossa! Heeresgruppe Nord (HGN) is a robust order of battle that lacks raw armored might, and suffers from inadequate air support, but enjoys deep reserves, great engineering pote...
- Mods indexed
- 8
- Versions
- 0
- Newest tracked
- none yet
- Most disruptive update
- No breakage data for this game
of 10 on Steam Workshop
Most downloaded
Measured from the source's own counts, summed across every release.
- MausAdds a company of Panzer VIII Maus to 194586 downloads
- Al Hudud OffensiveAl Hudud Offensive: Type/Length: Siege, 32 turns Attacker: (UK 1944) Difficulty: Normal Defender: (Germany 1944) Difficulty: Normal Requisition Mode: Fixed Point Schedule + Preset Unit Arrivals British armoured forces attempt to breakthrough strong German minefields and fortifications before the...36 downloads
- Siege of ParisSiege of Paris: Type/Length: Siege, 30 turns Attacker: (Germany) Difficulty: Normal Defender: (France) Difficulty: Challenging Requisition Mode: Fixed Point Schedule + Preset Unit Arrivals French forces defend Paris in a hypothetical siege of the city by German forces in June 1940. Defenses insid...35 downloads
- Bastogne DefenseSimple Bastogne encirclement scenario set in 1939 German defenders against Soviet attackers.33 downloads
- Fortress SassariFortress Sassari: Type/Length: Siege, 25 turns Attacker: (USSR, 1945) Difficulty: Easy Defender: (USA, 1945) Difficulty: Challenging Requisition Mode: Fixed Point Schedule American forces hold a precarious perimeter in northwestern Sardinia against overwhelming Soviet mechanized forces, inspired...30 downloads
- Somme ControlSomme Control: Type: Map Control Length: 30 turns Blue: (USA 1942) Difficulty: Normal Red: (USSR 1942) Difficulty: Normal This conquest style scenario pits the USA against the USSR on the Somme map in 1942. Every objective on the map is worth points and both sides receive requisition points every...27 downloads
- Snake River Conquest 1944 (GER vs. USSR)Conquest/map control scenario pitting Germany against the USSR in 1944 on Snake River. The Germans (technically the 'defender' start in the north, Soviet 'attacker' in the south. Neither side starts with any combat units, and instead recruit their army on turn 2. Paradrops are enabled, and all po...23 downloads
- Khokhlovo Conquest '44Conquest/map control scenario pitting Germany against the US in 1944 on one of the smallest maps in CAOS. Select 'defender' to play the Americans (starting in the west), 'attacker' to play the Germans (starting in the east). Neither side starts with any combat units, and instead recruit their arm...15 downloads
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Why Combined Arms Operations Series mods break
A mod is compiled against one version of a game. When the game updates, anything that reached into the parts that moved stops working, and it usually stops working silently rather than with a message that explains itself.
That is what the table above counts. It is not a guess: each row is a mod the community has reported as broken by that specific release. The number is a fair measure of how disruptive an update was, and it is the reason people delay updating a game they have modded heavily.
Common questions
Does IndexGG host Combined Arms Operations Series mods?
No, and it never will. Every download link points at the author's own page on Nexus, GitHub, CurseForge or wherever they published it. We index the ecosystem; the files stay with the people who made them.
Where does the compatibility data come from?
From the communities that maintain it in the open, not from guesswork. Each claim carries how it is known, so a reported breakage is never presented as though the author said it.
Why is a mod listed as broken when it works for me?
Compatibility depends on your exact game version and the rest of your load order. A mod marked as broken in one release may work fine on an older one, which is exactly why the version is recorded next to the claim rather than a bare yes or no.