The standard interpretation attributes the success of the Hyksos, the foreign invaders from Asia who brought the Middle Kingdom to an end, to their new weapons of war.
But the slow expansion of the Fourteenth Dynasty in the northeast already had helped to weaken the native Egyptian state of the Thirteenth Dynasty (1755-1630 bce). The Hyksos had military superiority and solidarity among themselves. The new military system is reflected in the Egyptian nomenclature for the newly arrived chariot and horse; the terms are West Semitic.
The Hyksos were successful immediately. First they overwhelmed the northeast Delta. Memphis then fell and most of Middle Egypt was lost to the Hyksos. Their move south into Egypt was facilitated by their chariot warfare, but they also employed ships for rapid movement. As before, the fast movement of troops in Egypt still proceeded by river. The next Theban state of the Seventeenth Dynasty (1630-1540 bce) copied many of its aspects from earlier times. But there was a strong consciousness of being on the defensive (Franke 1990).
Bronze weapons were effective on the southern front, but the inability of the Egyptian kings of the Thirteenth Dynasty (1755-1630 bce) to resist the Hyksos invaders proves that bronze metallurgy was not the key to a successful defense. A key to Hyksos victory was that Hyksos society included a permanent warrior elite.
The military reorganization during the Second Intermediate Period (Thirteenth to Seventeenth Dynasties) forced other major social and economic changes within Egypt. The Theban government had acquired horses, which were expensive and required a great deal of food. The investment in chariots required a constant, dependable supply of flexible yet hard wood, a commodity that was rare in the Nile Valley (Giumlia-Mair and Quirke 1997).
The northern-based Hyksos had immediate access to the two metals necessary for the forging of bronze; the southerners did not. So how could the Thebans of the Seventeenth Dynasty (1630-1540 bce) overrun the Hyksos in only two generations of warfare? Toward the end of the Second Intermediate Period, the Egyptians mobilized on the river. This is most evident in the war record of the naval officer Kamose (Habachi 1972; Smith and Smith 1976). His quick dashes downstream - first to the Cusae region in Middle Egypt and then up to Avaris - are remarkable. Memphis does not appear to have been a major obstacle.
The king Kamose (1545-1539 bce) was able to strike the north so quickly because the king’s fleet descended upon the Hyksos capital of Avaris and besieged it. Egyptian cities were not prepared for internecine warfare, and they surrendered quickly to Kamose. But in the Delta problems arose. The waterways were not as regular or reliable as the single conduit of the Nile south of Memphis. Moreover, the land was damper and less suitable for chariots. The mounds upon which the Delta cities rose were ideally positioned to withstand a siege. The Hyksos capital had major defensive fortifications, unlike those of Nile Valley towns. For these reasons the naval profession continued to be an important one in the late Seventeenth Dynasty (1540 bce), only declining when Egypt moved vigorously on land into southern Palestine. By the reign of Thutmose I (1493-?bce) the amphibian army came to an end, and a new land-based army, the core of which consisted of the chariot force, took over (Berlev 1967b: 19-20).
Meanwhile the Egyptian counterattack in the south retook Lower Nubia with remarkable speed, attributable both to the Theban fleet and to the superiority of
Egyptian arms. Now on the offensive, Kamose sent troops upstream to Buhen at the Second Cataract to take that key fortress-city. Rapid deployment over water positioned the Egyptian soldiers to use their superior weapons and their horses and chariots against the Nubians. Still, Kamose’s stela never mentions chariots in battle. He was afraid of being caught in the rear by Hyksos troops. Thus he might have been thinking that the enemy might try to send one segment of their army southward, through the Western Desert, in order to outflank the local populace. This account mentions horses, and so we know that the Thebans used them too. But Kamose’s fleet could bypass a fortified city on the way to conquering a more important center, thereby neutralizing the detoured area.
The warfare between the Thebans and the Hyksos, though involving new armaments, followed the earlier military practices of the Egyptians. The fragmentary battle scenes of Ahmose from Abydos depicted river encounters, most probably in the Delta (Bourriau 2000: 210-15).