The Lord replied to Gideon, “Go with all your strength and save Israel from the Midianites. I am sending you to do it.”
Then Gideon started all the excuses. “But Lord, how can I save Israel? My people are the weakest in Manasseh and I am the smallest and the youngest in my family.”
I think God probably smiled here, but He said “I will be with you, and you will defeat all the Midianites together.”
Then Gideon asked God for a sign. He wanted to be sure this was really God that he was talking to. Gideon didn’t have a Bible to follow and didn’t know how or if God went around talking to people, he wanted to be sure.
First he prepared an altar as an offering for God. This was the way they gave gifts and ask for forgiveness to God before Jesus died on the cross.
He set his offering (meat and unleavened bread) down on a rock and fire came from the rock completely consuming the meat and bread. And the angel of the Lord disappeared.
Then Gideon realized that it was the angel of the Lord.
That same night the Lord told Gideon to take down the altar his father had built for a pretend God (Baal) and to cut down an Asherah pole (this was made for another god people wanted to worship).
The Israelites had started believing in these fake gods and that’s why God had been angry with them. He is the only real and true God and these people were praying and giving offerings to pieces of wood and statues that can’t do or hear anything.
So Gideon took ten of his servants at night (because he was afraid of getting caught from the people in the town) and tore down the altars.
The people were mad when they realized Gideon had wrecked their altars but they decided that if Baal was really a god he could punish Gideon. Of course nothing ever happened to Gideon because Baal isn’t real.
Gideon still wanted to make sure that God would save the Israelites so he asked for another sign. He placed a piece of wool from a sheep on the ground. If there was dew only on the fleece and all the ground around it is dry, then he would know that God would save them.
When Gideon checked the wool in the morning it was soaking wet and the ground was dry. Still Gideon asked for one more sign…
This time he asked that the fleece would be dry and the ground would be wet. Sure enough, the next morning it was just as Gideon asked.