Tanks for Nothing!

Objectives
Destroy any manned tanks and bomb any unmanned ones.
 * Big Bessa slain
 * Unmanned Tanks Destroyed (3)

Description
The last threat to the airship is Theramore's arsenal of steam tanks.

Destroy any active tanks and set bombs on any unmanned vehicles.

Progression

 * 1) To the Waterline!
 * 2) The Blastmaster
 * 3) Gryphon, Down
 * 4) Tanks for Nothing!
 * 5) Fly, Spy!
 * 6) Minimum Safe Distance