'Spring' in the Bible

And when Joab had come out from David, he sent men after Abner, and they overtook him at the water-spring of Sirah, and made him come back with them: but David had no knowledge of it.

Now in the spring, at the time when kings go out to war, David sent Joab and his servants and all Israel with him; and they made waste the land of the children of Ammon, and took up their position before Rabbah, shutting it in. But David was still at Jerusalem.