I had never used Tornado before. Just had gotten my mage lev 5 in air.
Then I had a very bad surprise when Capitar DOWed me and came up with 3 stacks of nasties up my hindquarters the very next turn. After pondering what to do I took a look at my spell book and decided to try that.
I laughed myself so hard at the result that I reloaded the turn before to do it again, recording it at the same time.This totally destroyed the invasion force. I then split my army in 3 groups of 2-3 units and cherry picked all the units. Trololol.