You need like 20 or 24 archers to one-shot Limitanei with their shield wall.
Against many Limitanei, you should pick Jeanne's Champions at level 3 rather than Jeanne's Riders, because they help hold the line against the Limitanei.
As long as the knights survive, they can take engagements even against Limitanei and Spearmen; knights are the backbone of JD's army.
Typically in this matchup, we see Javelin throws more often than Longbows because you gain access to camel riders in the castle age, which give you the camel rider debuff against your opponent's knights.
JD's healing ability allows knights to win early engagements against Limitanei when numbers are low.
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