One thing I've found Billmen really useful for is breaking up the inevitable French Armoured spearman blocks you face 20-60 turns in (that is, if you've not smashed them by this time). Spearman for spearman, the French will generally grind English armies back but a head-on charge with Billmen breaks their lines up really well. They also chew up Knights if you can catch them in the flank or rear after they get tied up on braced spears.
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