I bought John Julius Norwich's "Short History of Byzantium" a few days ago, and I just came upon this little section about an EARLY Byzantine victory... (sometime around 356 AD)

"The following year near Strasbourg, his (Julian the Apostate) 13,000 legionaries smashed a Frankish enemy of 30,000 or more, leaving some 6,000 dead on the field at a cost of just 247 of their own men."

Just imagine the look on the Byzantine generals' faces when they got the final count. "HOW MANY???"