Or Amalek may have instigated the attack. Away in the Sinaitic wilderness there stood an altar which Moses had named Jehovah-Nissi, Jehovah is my banner, and that altar commemorated a great victory gained by Israel over the Amalekites. The greater part of a century had gone by since the battle, but the memory of defeat lingers long with the Arab--and these Amalekites were pure Arabs, savage, vindictive, cherishing their cause of war, waiting their revenge. We know the command in Deuteronomy, "Remember what Amalek did unto thee by the way, when ye were come forth out of Egypt. How he met thee by the way and smote the hindmost of thee, even all that were feeble behind thee. Thou shalt blot out the remembrance of Amalek from under heaven. Thou shalt not forget it." We may be sure that Reuben and Gad did not forget the dastardly attack; we may be sure that Amalek did not forget the day of Rephidim. If Moab was not of itself disposed to cross the Jordan and fall on Benjamin and Ephraim, there was the urgency of Amalek, the proffered help of that fiery people to ripen decision. The ferment of war rose. Moab, having walled cities to form a basis of operations, took the lead. The confederates marched northward along the Dead Sea, seized the ford near Gilgal and mastering the plain of Jericho pushed their conquest beyond the hills. Nor was it a temporary advance. They established themselves. Eighteen years afterwards we find Eglon, in his palace or castle near the City of Palm Trees, claiming authority over all Israel.