In my over simplified speaking way, I will briefly discuss Hanukkah. The battles are not the main point. The miracle of having energy. In those days it was that oil. Finding the materials for rebuilding the temple and etc.
Link 3-The Menorah Versus Other Energy Today the candles that are lit do not last for 30 minutes. They burn out in minutes. Going back to the historical facts, those candles remained lit for a longer period of time.