|Required techs|| Combustion|
|Units enabled|| Tank|
- "The root of the evil is not the construction of new, more dreadful weapons. It is the spirit of conquest."
- –Ludwig von Mises
After the potential of the new armored combat vehicles is revealed, Combined Arms develops a strategic, methodical approach to their use and their countering in modern warfare. As a result, the design and efficiency of the Tank is improved, and a new weapon - the Anti-Tank Gun - is created to counter armored vehicles.
Combined arms is a military doctrine first adopted more than a thousand years ago, which involves the combination of different-but complimentary-unit types in an effort to improve the overall efficiency of the force as a whole. In ancient times, the combined arms strategy was utilized by many of the major powers, particularly the Greeks and Romans, who carefully coordinated light and heavy infantry, cavalry, and ranged weapons to create cohesive formations that played off each other's strengths and weaknesses. During the 20th century and onwards, the rise of aircraft-based weaponry has led to even more complex variations on the traditional concept of combined arms. Drone aircraft, satellite-guided missiles, and high-altitude bombers are just a few examples of the expanding toolset available to modern military commanders.