The military evolution of the Roman Empire Part 2

- **Early Rome**: Militia of citizens, phalanx to manipular legions.

- **Punic Wars**: Legions evolve, more tactical flexibility.

- **Marian Reforms**: Professional army, standardized gear.

- **Caesar's Era**: Engineering in warfare, loyal legions.

- **Augustus**: Permanent legions, Praetorian Guard, auxiliaries.

- **Late Empire**: Cavalry emphasis, mercenaries, dual army system.