Less ranged Nords?

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I'd say commandos should be charging out as a group after the melee enemies are killed. The exception to this is then there are ballista-men who can shoot through shields. Another exception would probably be einherjar snipers and jotne waves.  Makes waves go a lot faster if you don't just sit around waiting for the ranged players to kill all of the enemy ranged. And as suggested above, being a arrow sponge is also helpful for speeding up the process. But if you have enough commandos, moving out in force often works wonders. It's also safer if more commandos move out together. Don't just sit around after the melee enemies stop charging at the shield wall.