Original sentence: Prior to the battle, the Flemish militia had either been ordered to take no prisoners or did not understand (or care for) the military custom of asking for a ransom for captured knights or nobles; modern theory is that there was a clear order that forbade them to take prisoners as long as the battle was as yet undecided (this was to avoid the possibility of their ranks being broken when the Flemish infantry brought their hostages behind the Flemish lines)
Edited sentence: Prior to the battle, the Flemish militia had either been ordered to take no prisoners or did not care for the military custom of asking for a ransom for captured knights or nobles; modern theory is that there was a clear order that forbade them to take prisoners as long as the battle was as yet undecided (this was to avoid the possibility of their ranks being broken when the Flemish infantry brought their hostages behind the Flemish lines)