Northern Slingshot Woods - 1 is the first level of Northern Slingshot Woods, the location is located at the north of Slingshot Woods. This will be a battle between you guys and Corporal - your old boss, Bird Catcher and Worker.
You have to engage 2 Bird Catchers, 2 Workers and 1 Corporal. Each enemy's stats are shown below.
Choose Matilda in Druid and any other birds in their latest class (headgear) (except Chuck). Heal with Matilda if the birds' healths are not full. If they're full, attack with her. Then attack with the others (the Bird Catchers, then the Workers and the last one, Corporal). Repeat this over until you win or either lose.
Take them down as you normally would.