Egypt at this time was not able to defend herself against an army that had become experienced and confident under the command of Cyrus; consequently, the country fell rapidly into the hands of the new Persian king. Far from showing the leniency of his father toward the vanquished, he marked his victories with needless cruelty. The two great powers of Africa besides Egypt were the states of Ethiopia in the south, and Carthage in the northwest. Of the former we learned something in The Story of Egypt; of the latter we shall learn later on. Suffice it to say here that the Carthaginians were colonists of the Phoenicians, and, like them, were traders whose commerce penetrated to all lands washed by the Mediterranean Sea. When Egypt lay at his feet, Cambyses resolved to make himself supreme in the whole continent of Africa--only the northern portion of the continent was then known. Accordingly, he directed troops to advance against these two powers which he thought alone worthy of his notice. Now Carthage could only be taken by sea, and the king was limited to Phoenician vessels, manned by Phoenician sailors. These men promptly refused to make war on their own colony, whose interests were so closely interwoven with those of their country. Their stand must have been united and firm, for Cambyses found himself obliged to abandon his project. The expedition to the south was disheartening. The Persian soldiers were unused to the hot sands and intense sun of Nubia and great loss and discouragement overtook the army. Those who withstood the heat were too exhausted by the march to accomplish anything. The king remained in Egypt. He was constantly haunted by his crime against his brother. He realized his unpopularity with his subjects, and feared that disaster would at any time overtake him. His fears were shortly reflected in his soldiers, who having learned that they were no longer led by one who could bring victory in the face of opposing obstacles, lost heart and fought indifferently.