1. Viktor Suvorov's Inside the Soviet Army describes how Cold War era Soviet military districts were actually composed of a front headquarters and a military district headquarters co-located for administration and deception reasons.
5 Facts About Army
2. Until 1733 the common soldiers of Prussian Army consisted largely of peasantry recruited or impressed from Brandenburg-Prussia, leading many to flee to neighboring countries.
3. Roman Army had its origins in the citizen army of the Republic, which was staffed by citizens serving mandatory duty for Rome.
4. The Spartan Army was largely composed of hoplites, equipped with arms and armor nearly identical to each other.
5. Spartan Army was one of the earliest known professional armies.