In this mission, use Goblin Sappers and Siege Specialists because the towers are close together. Start by sending a unit to the left to defeat the Darkspear Trolls.

Then, send a melee unit as bait to reach the first tower. When the enemy Grunts and Blackrock Pyromancer spawn, use Safe Pilot to defeat the pyromancer and counter the Grunts with Fliers. Send Minis ahead with Sappers or Siege Specialists to capture both towers and defeat Draaka quickly.