Militia sergeants are actually quite good when you use them the right way. Look as them as semi-trained peasants with armour piercing ability. Use them as flankers (as mercians not many other infantry qualifies for this role). They will do a more than decent job against pinned cavalry or other armoured unit. Don't use them in one-on-ones unles you have to. They also shine in the woods against cav.
Woodsmen (if you can get them as Mercia) are probably better in their role as pure flankers due to their excellent charge but woodsmen don't have such a staying power as miitia sergeants.
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