In AW:DS, the Dual Strike of Drake and Olaf rips basically everything to shreds. You take a normal turn with Drake, and at the end of your turn, you use the dual strike. This is because Drake's Dual Strike causes FoW (if you have adequate detection/are already in FoW, then you can start the dual strike at the start of your turn). So now all enemy units lose two health, and have their fuel halved. But wait, there's more! Now you swap out to Olaf, who takes off another 2 health from every enemy unit, and they now use twice the regular amount of fuel for the next two turns.