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I checked it properly but the misreading is not corrected. At around 20:52 it says "vulnerable on flat ground", but the correct wording is "vulnerable on uneven ground". My apologies. References: "Ancient Weapons, Armor and Tactics" by Martin J. Dougherty; "War and Technology" by A. Rowland; "Greek and Roman Wars" by Harry Sidebomb; "Ancient Roman Battles" by Adrian Goldsworthy; "A History of Combat Techniques" by Simon Angliam et al.; "The Ancient Roman Legion" by Adrian Goldsworthy; "The Pictorial History of the Soldier" by R.G. Grant. Image source: Wikimedia Commons, public domain, Irasutoya pixabay, Background video pixabay, BGM source: "Frog's Piano" "Storyteller's Room" by shimtone, DOVA SYNDROME