Pumpkin Plateau - 2 is the second level of Pumpkin Plateau. Looks like you've just run into a platoon of guards. And they're not happy to see that you're closing in on Pig City.
See Difficulty System for more informations.
Tickle - Deals 68 damage. Empties the Rage Chili by 5%.
Bash - Deals 75 damage.
Stumble - The pig stumbles and does nothing. Stupid pig.
Smack - Deals 105 damage.
Alarm - All pigs receive 30% less damage. Lasts 3 turns.
Ironclad - Passive: Ignores damage less than 88.
Choose Matilda in Druid, Bomb in Cannoneer and The Blues in Spies. Heal with Matilda if the birds' healths are not full and if they're full, attack with them. Then attack with the others. Use the Rage Chili on The Blues (if there are only a pig on the battlefield) or Bomb (if there are more than a pig on the battlefield) or Matilda (when any bird's health is under 65%) when it is full. Repeat this over until you win or either lose.
Guard Captain has the passive ability "Ironclad", so he should be your first priority.