Gunship Battle Episode 29 Mission VI with

How to Complete the Mission 6 of Episode 29 in Gunship Battle.
Mission : A tremendous crisis
Objective :
i) Destroy Arche
ii) Destroy Mad desert
Destroy 6 mad desert and 2 Arche to complete the mission.
Then timer of 2 mins will run.
again 2 Arche will come and Some mad desert will come to destroy our gunship. destroy them and survive till the timer ends.