Explaining would take all the fun out of it. Well, I'd consult Mark Twain's Joan of Arc book first and after depriving particular military strategies from it, I would commence to set up. Dig the pen out from the radiator where its been lying in peaceful repose for over a year. If it is dry, add a bit of spit to the end and try writing. Scientists are discoverers, methodically searching for truths of the natural world.
Poets are creators, expressing feelings and emotions from their own mind.
Scientific theories are testable in the external world, giving feedback, and a sense of accomplishment, whether they are falsified or not. A poets search is more often than not about feelings and directed inward, and when this inner search fails, or is unsatisfying, the poet would be more likely to feel despondent, hopeless, despair, and possibly, madness. Poets are also historically more open to 'mind altering substances' 3. I believe I could repel an invasion with a few relatively harmless exploding fireworks. I would plant them around the vicinity, and when the Vikings start the actual charge, I would proceed to detonate.