Im having a bit of trouble reaching requirements with the samurai warriors, all the people im using at level 65+ and its on easy! im just not quick enough to kill all the officers in messengers way then kill the oficers attacking the random blue guy at the top of your map :S. Anyone have any ideas?

You shold just stay with your messengers then, don't leave their side. Also, make sure you clear out all troops as well so the messengers dont engage in battle. Also, use a horse.