Gideon's already heard from God, even seen a divine sign. So why is he asking for more assurance?
Gideon's request isn't born out of doubt in God's power, but a deep understanding of the monumental task ahead. He's not questioning if God can save Israel, but seeking confirmation that it will be through him, just as God declared.
Think of it like this: God says, 'I'm going to give you a million dollars.' You're grateful, but you might still ask, 'So, how exactly is this happening? When? What do I need to do?' Gideon is in a similar place. The Midianite army is vast, and he feels the weight of responsibility. His request is a humble plea for reinforcement, a way to solidify his faith and encourage his hesitant soldiers by recalling God's explicit promise.