https://scholarworks.umt.edu/cgi/viewcontent.cgi?article=12641&context=etd

Ammianus Marcellinus, a 4th century CE Roman historian described how the Huns fought in battle:
As they are lightly equipped for swift motion, and unexpected in action, they purposely divide suddenly into scattered bands and attack, rushing about in disorder here and there, dealing terrific slaughter; and because of their extraordinary rapidity of movement they are never seen to attack a rampart or pillage an enemy’s camp.258

Michael Psellos, a Byzantine monk,

“saw only disorder, remarking of the Petchnegs, that ‘they are not divided up by battalions and when they go to war they have no strategic plan to guide.’ They attack, he writes, ‘in one mass, close-packed and pell-mell’ and ‘when they break away there is no order in their retreat.”259

Sima Qian wrote:
“They are skillful at using decoy troops to lure their opponents to destruction. When they catch sight of the enemy, they swoop down like a flock of birds, eager for booty, but when they find themselves hard press and beaten, they scatter and vanish like the mist.”261