A larger image of John I Tzimiskes conquers Preslav and Basil II conquers Pliska.
Miniature 65 from the Constantine Manasses Chronicle, 14th century: John I Tzimiskes conquers Preslav and Basil II conquers Pliska
Source: Miniatures from the Manasses Chronicle, Ivan Duichev, "Bulgarski hudojnik" Publishing House, Sofia, 1962
Referenced on p41, D.Nicolle, A.McBride - MAA 195 Hungary and the Fall of Eastern Europe 1000-1568
Manasse's Chronicle, 1344-5. Compared to the Byzantine History of Alexander, this Bulgarian manuscript is harder to interpret. Yet the figures in the upper register clearly have no visible armour other than helmets and perhaps lamellar aventails (Cod. Slav. 2, Vatican Lib., Rome.)