So, my enemy is coming to attack a small town. My heroine has decided to lure the enemy into the heart of the evacuated town, and then set fire to the whole place from the periphery and burn the enemy to death, because facing the enemy head-on in battle would be suicide. For context: this is a fantasy novel, roughly medieval setting. There is magic but I'm trying to keep the fact that my heroine is actually a mage a secret, so I don't wanna say "magic did it". The town: it is small, full of wooden buildings in close proximity of each other. It should really burn quite well all on its own. Dilemma: I need the fire to burn fast. I need the fire to engulf the entire town and to burn so bad that the enemy cannot get out (some obviously do get out, but I want the fire to kill off most of them). At first I thought you could douse the periphery of the town with a trail of oil, but a friend asked if the enemy wouldn't notice the smell and thus catch on to the plan? Then I thought of using bundles of fur and clothes, but the same friend asked if the fur/clothes wouldn't just burn up really fast and not actually help spread the fire at all? So, thoughts? What would help the town catch fire super quick without giving the plan away to the enemy?