First off, I am not sure on whether this is new or not, but I couldn't find any reference to this from Frogbeastegg's unit guide, nor from any other guides.
Secondly, this tactic might be considered as a borderline exploit, like the two-rank swordsmen tactic but even more so.
So, I have noticed that when you put a high-charge(relatively) cavalry unit (e.g. mounted sergeants, feudal knights or Armenian heavy cav) in a single line and hold formation, then charge it at enemy unit (the formation has to be relatively intact) but at last second switch to Engage at will, it will cause the enemy unit to take heavy casualties and insta-rout. The timing of the switch is important - too late or too early will not yield such dratic results, though it still may work on some weak units. The rout is really instant - sometimes the unit routs so fast that after the battle ended and the win-screen pops up, when you hower your cursor over the enemy unit, it does not show any losses although the unit took considerable losses.
This does not work on spearmen or pikes, nor foot knights (though they will take casualties), and does not work well on polearms (the timing has to be perfect and probably multiple charges needed).
I theorise that the insta-rout is due to combined morale shocks from casualties, cavalry charge and being outflanked due to the single line formation wrapping around them.
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