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Let's suppose Henry V of England had the time and inclination to recruit a few specialized and trained agents. What do they do?
Master themselves of many languages
Enter cities and disguise as a local (in a village hamlet, outsiders will be spotted even if they can pass off the local customs)
Pay actual (obviously non loyal) locals to keep eyes and ears open
Smuggle stuff
Keep horses hidden around (some free peasants/levies/militia were actually gifted horses by grateful lords so a farmer having a horse would be unusual but not unheard of) that are ready to be ridden by an unfamiliar rider at a moment's notice (some horses are finicky about riders)
Collect information (laughably easier than you might think, in these days anyone with fancy cloths can usually bluff their way into the same room as a monarch as long as it's a big room like a throne room and not private quarters, it was after too many notables were killed in gunpowder assassinations that security started tightening)
Be able to move around in night without making noises and be easily observable in the mains streets
Able to live "off the land" in plains and forests for over a week
Ready to steal stuff (this is harder than getting in the same building as a king, anything worth stealing usually were secured, but hey CK2 has some events like this... more seriously burglary was always a crime since ever, why can't you train someone to do it better than a run-out-of-mill criminal?)
Someone suggested to me this alt-Henry V's stealth corps ought to be called the Arcani, after their Roman equivalent, which was supposedly first use in Roman Britain.
I forgot about this for awhile until I made a French Revolution thread and someone mentioned the SAS.
Anyways, is there a cool name for them in either English or Anglo-Norman that has the acronym SAS without using "service"?