The way I successfully completed this level was by moving all my troops to one end of the river so that when crossing, I would not be attacked by all sides by the archers. Then I sent across my cavalry first in a tight formation so that they would take minimal damage. Because the cavalry is the focus of the archers attacks, you can then proceed to bring across the rest of your troops safely. Once across, defeat only the closest archers and then proceed to the marked area through the woods, which will allow you to ultimately sneak past the rest of the archers.

all u have to do is get to the north boundary of the map and shoot fire arrows NEAR the closest enemy archers, to see them put a scout in the water just out of their range, they will then retreat south and u can safely cross and run to the zone. But i continued to use fire arrows and make all of their archers go into the river, then i do to them what they do to me, raid them with arrows for exp

first when you kill the infantry go to the end of the river. then burn some of the woods. later grt the archers to shoot fire acroos the other side. then there will be a big space then sneak acroos.