100: Critical success.
81-99: Rousing success. Everything goes better than expected
51-80: Success. Everything goes as planned
26-50: Barely a success. You succeed in your end goal but take some sort of negative in doing so
11-25: Mild fail, fail with some minor consequence
2-10: Major fail, fail with more serious consequence
1: Critical fail.
How big is the town exactly? We may want to figure that out. And once the town knows an attack is happening, will the ones who are further away mount a counter attack?