15 And Moses built an altar, and called the name of it Jehovahnissi:
16 For he said, Because the Lord hath sworn that the Lord will have war with Amalek from generation to generation.
–Jehovah-Nissi is Hebrew for “The Lord our Banner” and carries with it the idea of a rallying point for soldiers. Just as US soldiers would rally behind the American Flag, so too should Christian soldiers rally behind God. That means that as God has pledged to war against Amalek in every generation, we should also be ready to battle with our own Amalek (in the Bible, Amalek is a type of our flesh). This war is played out in our lives every day just as it has for thousands of years. The fact that the Lord swears to always do battle with Amalek (the flesh), proves that the flesh is still with us and fighting against us. We are expected to take up position behind the Lord and fight back.