sillybuddy level 5 healers are the key for survival with level 11. all you have to do is wait until the enemy comes out of their castle to attack you then counter with a big army to take the keep once they have less troops. defenders front row archers second row then healers is all i needed to stomp the enemy.
If you watch the storyline in stage 2 you see that your King gets a weapon after you lose your first battle. The weapon is super powerful and will kill any amount of troops with it on stage 2.
I put 6 rows of gunners with full upgrades on walls for earth and never lost a unit. They are a little OP when you have 30 on the battlefield obama went down fast!
if you pick up units on the battlefield like extra walls you dont need and delete them you have a chance of getting a unit lose even tho it says you wont
thanks for reporting this anewbous , i sent you a massege , i will fix this as soon as possible.