Why did the Roman Soldier of the 6-7th c. AD become a Horse-Archer?

Additional Viewing:

Videos by 'The Historian's Craft' detailing the 'barbarization thesis'
1. 'Tattoos, Barbarians, & Barbarian Imagery in the Late Roman Army'
   • Tattoos, Barbarians, & Barbarian Imag...  

2. 'How Barbarized was the Late Roman Army? Weapons Burials, Barbarian Influence, & Militarization'
   • How Barbarized was the Late Roman Arm...  

Additional works cited:
Volynkin D.G. — Structure and organization of the mobile army of Emperor Gallienus in 260–268. // Historical journal: scientific research. – 2021. – No. 3. – P. 16 - 26. DOI: 10.7256/2454-0609.2021.3.35700 URL: https://nbpublish.com/library_read_ar...

Procopius, 'History of the Wars' on Wikisource: https://en.wikisource.org/wiki/Histor...

G.T. Dennis, 'Maurice's Strategikon' 1984, University of Pennsylvania Press