Gideon built an altar - and called it Jehovah-shalom - The words שלום יהוה Yehovah shalom signify The Lord is my peace, or The peace of Jehovah; and this name he gave the altar, in reference to what God had said, Judges 6:23, Peace be unto thee, לך שלום shalom lecha, "Peace to thee;" which implied, not only a wish, but a prediction of the prosperous issue of the enterprise in which he was about to engage. It is likely that this is the altar which is mentioned in Judges 6:26, and is spoken of here merely by anticipation.
Gideon‘s naming the altar which he built, in commemoration of the words of peace spoken by the Angel, is very similar to what we read of Abraham Genesis 22:14, and of Moses (Exodus 17:15, when he named the altar Jehovah-nissi).