There are 4 maps in this chapter:
7. Save the Village
8. Kohuhu Escort
Continue using 2 Archers and as many Soldiers as you can. Ignore the new choices.
9. The Wyvern Queen
I suggest you pick 2 Archers, 2 Soldiers and pick from an additional Archer/Soldier or Gunner. There are 13 enemies you should have no trouble with, followed by the boss battle.
BOSS Bride of Jar Jar Binks: You want to have the Archers/Gunner targeting the boss always, and the Soldiers taunting and killing whatever comes your way. Be sure the archers heal and fire flame arrows.