If you were to plan a strategy to free the children of Israel from the cruel hand of the Philistines, would you choose the jawbone of a donkey or perhaps a great military weapon or army or maybe anything else? A jawbone just does not seem like the most probable choice.
Unless . . . the point would never be the weapon. The focus of the victory would never be the analysis of the strategy taken. The tool of the judge would never be the highlight of the story.
God can bring about amazing results from small things!