Zama, 202 BCE
A levy system survives Hannibal.
Law, language, and the idea of a professional frontier army as a European afterlife. US and revolutionary French republican costume borrowed the nouns.
A long duration score that later powers keep citing -- usually badly.
Lessons
Actium, 31 BCE
A civil war ends in a navy's photograph.
Adrianople, 378
A late army's public disaster.
Keep the cost as a range
not one war -- a centuries-long institution; human cost is spread across conquests, civil wars, and frontier wars Roman military is not improved by a fake precise integer.
Memory is national
US/UK/AU/CA rites and the memory of Italy, then the Mediterranean and European-Near Eastern frontiers will not match. Name the difference when teaching Roman military.
Unresolved
Census still a band
"not one war -- a centuries-long institution; human cost is spread across conquests, civil wars, and frontier wars" remains a band. New archives refine Roman military; they do not un-happen c. 6th century BCE-5th century CE in the West (East continues as Byzantine -- a sequel file).
Archives uneven
Files on Roman military remain unevenly open across Italy, then the Mediterranean and European-Near Eastern frontiers. Trajan's paper trail is not the same as Scipio Africanus's.
Testudo
A Hollywood-famous formation -- over-photographed, under-contextualised.
Teaching hours
English classroom hours on Roman military still disagree with hours in Italy, then the Mediterranean and European-Near Eastern frontiers. Is this a how-to? is often the gap.
Shifts
Republican levy
To 202 BCE: Italy to a Mediterranean win.
High empire
31 BCE-180: Pay, forts, a famous peace with wars on the edge.
Late West
284-476: Diocletian-Constantine structures; Vegetius; a classroom end.
Afterlife of the name
Roman military left institutions and stories that outlasted c. 6th century BCE-5th century CE in the West (East continues as Byzantine -- a sequel file). Scipio Africanus became a caption; Italy, then the Mediterranean and European-Near Eastern frontiers kept the rubble or the letterhead.
Outlook
Scholarship
New archives will refine Roman military (Caesar's civil war, Adrianople) without un-happening c. 6th century BCE-5th century CE in the West (East continues as Byzantine -- a sequel file).
Memory handover
As witnesses die, museums and film carry Roman military. Gaius Marius and Julius Caesar will keep being recast.
This atlas
Roman military stays a historical file -- institutional history, not a live order of battle or a method.
Risk
closed institution; live memory
The Roman military is a historical institution. Residual risk is bad analogy and any use of this page as a drill, siege, or coup method -- forbidden here.
The RN and US pages inherit words more than structures.
The ROK page may analogise conscription cost -- carefully.