A severe struggle was impending; for as the spies reported, the Amalekites had been joined by other desert tribes.

Nevertheless the Hebrew troops were twice their number.

But how greatly inferior in warlike skill were Joshua's bands to the foes habituated to battle and attack.
The enemy was advancing from the south, from the oasis at the foot of the sacred mountain, which was the ancient home of their race, their supporter, the fair object of their love, their all, well worthy that they should shed their last drop of blood in her defence.
Joshua, now recognized by Moses and the whole Hebrew people as the commander of the fighting-men, led his new-formed troops to the widest portion of the valley, which permitted him to derive more advantage from the superior number of his force.
He ordered the camp to be broken up and again pitched in a narrower spot on the plain of Rephidim at the northern end of the battle-field, where it would be easier to defend the tents.

The command of this camp and the soldiers left for its protection he confided to his cautious father.
He had wished to leave Moses and the older princes of the tribes within the precincts of the well-guarded camp, but the great leader of the people had anticipated him and, with Hur and Aaron, had climbed a granite cliff from whose lofty summit the battle could be witnessed.

So the combatants saw Moses and his two companions on the peak dominating the valley, and knew that the trusted servant of the Most High would not cease to commend their cause to Him and pray for their success and deliverance.
But every private soldier in the army, every woman and old man in the camp knew how to find the God of their fathers in this hour of peril, and the war-cry Joshua had chosen: "Jehovah our standard!" bound the hearts of the warriors to the Ruler of Battles, and reminded the most despairing and untrained Hebrew that he could take no step and deal no blow which the Lord did not guide.
The trumpets and horns of the Hebrews sounded louder and louder; for the Amalekites were pressing into the plain which was to be the scene of the battle.
It was a strange place of conflict, which the experienced soldier would never have selected voluntarily; for it was enclosed on both sides by lofty, steep, grey granite cliffs.