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The answer for the specific period of the Hundred Years war is separated in the following parts:
For the first type of operations, recon was not performed, besides groups of hors*m*n that were looting there and there and sometimes found enemy groups. Overall, those operations, largely performed far from Paris, did not encounter resistance so recon was not a need. But as time went on, this proved bad: an English raiding group was destroyed by Bertrand DU Guesclin's army West of Paris.
For English royal army, recon was not performed on a theoretical scale: no units were set to perform long range recon, however there were of course units guarding flanks to avoid surprise. But if you look at battles as Agincourt for example, there is a scenario where French Army surprise the English army on a strategic scale, but is too slow to attack immediately and let the time for English soldiers to entrench themselves and ultimately repel French assaults.
Conclusion:
No specific units existed to perform recon by that time, as the main cavalry was heavy knight cavalry and only poor or apprentice knights were light enough to perform recon. Recon largely used the civilian population to gather intelligence. There were no doctrine to perform "battle recon" with mobile and fighting units, although some light cavalry fights might have occurred marginally.
Upvote:-1
I'm not sure this fits the criteria of your question, but the De Velitatione Bellica gives a lot of information pertaining to reconnaissance by the Byzantine army in the context of the Arab-Byzantine wars (10th century, written for the emperor Nikephoras Phokas). You can find it in "Three Byzantine military treatises" by George Dennis.