In the second episode of The Battles That Made Us, we delve into the battles of Arar and Bibracte that took place in 58 BC. This episode examines the context behind the Roman involvement in Gaul, following the defeat of the Aedui tribe by the Germanic tribe of the Suebi, and how the migration of the Helvetii through western Gaul prompted Rome to intervene. Jay and Matt also explore the principles of war that were employed by Julius Caesar during the conflict and examine the Roman legions' composition and capabilities. Additionally, they discuss the relevance of border security when dealing with internally displaced persons and refugee crises.