Quincunx and Keppie\'s hypothesis

[Cesco]

We have accounts of rear lines (boethos) receiving a retreating/fleeing front line (promachos) as a tactic with the men of the latter retreating through sizable gaps in the Roman/Byzantine manuals with much detail as to how these gaps were formed, their size, how they could be made invisible to the enemy, how the retreating men should be checked and reorganized.

Are these manuals available on the web? I would be very gratefull if you could give me some informations!