What does 2 Samuel 21:2 mean?

So David called the Gibeonites and spoke with them. (The Gibeonites weren't Israelites but survivors of the Amorites. The Israelites had promised to protect them, but Saul tried to wipe them out in his zeal for Israel and Judah.) 2 Samuel 21:2 - Modern Text Bible

(The Gibeonites were a protected group, but Saul broke Israel's promise and attacked them, causing the current crisis.)