the Strategikon of Maurice (known in Greek as Maurikios), written in the late 6th century and attributed to the emperor Maurice
In the late 6th century, the Emperor Maurice (r. 582–602) in his Strategikon used droungos to refer to a specific tactical deployment, usually of cavalry, although still in the general sense of "grouping, division".
By the time of Procopius's histories and Maurikios's Strategikon, the main effective field arm of Roman armies was cavalry, many of them armed with bows.