[Psycho]

You have the same situation again - the lead archer lost an arm and they all went into melee then. Your lead archer is unit with ID number 3986 - he is located in battle in the square up and left to the eagle king in the center. The second volley of TC arrows did him 5 damage and took his arm. Maybe try using some arrow catchers in battle.

The mammoths routed because half of them were killed (5 of 10), they have poor morale to start with and they were also starving.