I think the Historical (European) Battles I am offering could be replaced by campaigns. Campaigns from these DLCs would be related to each other - in each DLC there would be completely new civs, but only those that we have would be playable, e.g. Danes would appear in the campaign from the first European DLC, but playing Danes would be blocked if you did not have a second European DLC (adding Danes civ). Here are the suggestions for new campaigns to be added to the two European DLCs:
The Napoleonic Wars DLC campaigns:
Thirty Years’ War
- Siege of Pilsen (1618) - Protestant Bohemia (Germans civ) ally with Palatinate (Germans civ) vs Bohemian Catholics (Germans civ)
- Battle of White Mountain (1620) - Habsburg Monarchy* (Austria-Hungary civ) ally with Catholic League (Germans civ) and Spain vs Bohemia (Germans civ) and Palatinate (Germans civ)
- Siege of Nuremberg (1632) - Kingdom of Sweden vs Holy Roman Empire Army (Germans civ)
- Battle of Lützen (1632) - Kingdom of Sweden ally with Saxony (Germans civ) and Hesse-Kassel (Germans civ) vs Habsburg Monarchy* and Catholic League (Germans civ)
- Battle of Nördlingen (1634) - Habsburg Monarchy* ally with Catholic League (Germans civ) and Spain vs Sweden and Heilbronn League (Germans civ)
- Battle of Wittstock (1636) - Kingdom of Sweden vs Habsburg Monarchy*, Holy Roman Empire Army (Germans civ) and Saxony (Germans civ)
- Battle of Prague (1648) - Bohemia (Germans civ) vs Kingdom of Sweden
Exclusive for owners of the second European DLC
- Battle of Colberger Heide (1644) - Denmark–Norway (Danes civ) vs Kingdom of Sweden
Napoleonic Wars
- Battle of Austerlitz (1805) - French Empire vs Austrian Empire* (Austria-Hungary civ) ally with Russian Empire
- Battle of Jena–Auerstedt (1806) - French Empire vs Prussia* ally with Saxony (Germans civ)
- Battle of Friedland (1807) - French Empire ally with Kingdom of Saxony (Germans civ) vs Russian Empire
- Battle of Wagram (1809) - French Empire ally with Saxony&Bavaria (Germans civ) and Italy* vs Austrian Empire*
- Battle of Waterloo (1815) - United Kingdom (British civ) ally with Prussia*, Hanover (Germans civ) and Netherlands (Dutch civ) vs French Empire
Exclusive for owners of the African Royals DLC
- Battle of the Pyramids (1798) - France vs Ottoman Empire ally with Mamluks* (potential Arabs civ)
Exclusive for owners of the second European DLC
- Battle of Borodino (1812) - Russian Empire vs French Empire, Duchy of Warsaw* (Polish-Lithuanian civ), Italian Kingdoms* and German Kingdoms
- Battle of Berezina (1812) - Russian Empire vs French Empire, Duchy of Warsaw* (Polish-Lithuanian civ), Italian Kingdoms* and German Kingdoms
- Battle of Leipzig (1813) - Austria* ally with Russia, Prussia*, Sweden and Saxony (Germans civ) vs France, Duchy of Warsaw*, Italy* and Saxony (Germans civ)
Franco-Prussian War
- Battle of Saarbrücken (1870) - France vs Prussia* and North German Confederation (Germans civ)
- Battle of Gravelotte (1870) - Prussia* ally with North German Confederation and Saxony (Germans civ) vs France
- Battle of Sedan (1870) - North German Confederation ally with Prussia*, Saxony (Germans civ) and Bavaria (Germans civ) vs France
- Siege of Paris (1870–1871) - Prussia* ally with North German Confederation and Southern Germans vs France
- Unification of Germany (1871)