The Persians shoot into a strong wind that reduces the force of their arrows, while Procopius credits Roman archery methods learned from the Huns. Persian cavalry units rotate forward from a second line as the front ranks tire or exhaust their ammunition. That relief system maintains missile pressure without committing immediately to close combat. Only after many horsemen on both sides have spent their arrows does the fighting turn into a cavalry charge, so weather, ammunition, and unit rotation shape the moment of contact.
Notable Point · 21:54-22:22
Wind and relief lines shape Dara's arrow exchange
The opening missile fight shows how wind, borrowed archery techniques, and the rotation of Persian cavalry lines affected combat before either side charged.