Rise of Nations Wiki
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War is the natural state of the masses!
- Benito Mussolini, 20th century Italian dictator

Nation-in-Arms is the sixth Military.png Military Research available at the Library. It is preceeded by Levee en Masse and is required to research the seventh and final Military.png Military technology, Selective Service.

Researching Nation-in-Arms further increases the Population Limit.png population limit by +25. It also unlocks the Bunker, the Redoubt and the Strategic Reserves and Strategy technologies for the Forts, as well as the Howitzer (Katyusha Rocket for the Russians), the V2 Rocket and the Nuclear Missile.