That’s the story behind Saul’s building an altar to God. It’s the first altar to God that he built.
Samuel took a young lamb not yet weaned and offered it whole as a Whole-Burnt-Offering to God. He prayed fervently to God, interceding for Israel. And God answered.
Early the next morning, the people got busy and built an altar. They sacrificed Whole-Burnt-Offerings and Peace-Offerings.
Then Gideon built an altar there to God and named it “God’s Peace.” It’s still called that at Ophrah of Abiezer.