It depends on the faction since defensive infantry are quite hard to definitively kill. Having an additional identical archer is actually quite useful if the enemy is packing expensive cav because it by itself makes it hard to use cavalry since it will have extra ammo to spend and will be able to swing cav engagements your way... which will make it much easier to win a cav fight and mass rout the battle line. Also good in no cav at all cases because then it can break away and prevent flanking because it can shoot flankers or doods chasing your cav in the back.
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