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Early Twelfth Dynasty

From the Twelfth Dynasty onwards, pharaohs often kept well-trained standing armies, which included Nubian contingents. These formed the basis of larger forces that were raised for defense against invasion, or expeditions up the Nile or across the Sinai. However, the Middle Kingdom was basically defensive in its military strategy, with fortifications built at the First Cataract of the Nile, in the Delta and across the Sinai Isthmus.

Early in his reign, Amenemhet I was compelled to campaign in the Delta region, which had not received as much attention as Upper Egypt during the 11th Dynasty. Also, he strengthened defenses between Egypt and Asia, building the Walls of the Ruler in the East Delta region. Perhaps in response to this perpetual unrest, Amenemhat I built a new capital for Egypt in the north, known as Amenemhet It Tawy, or Amenemhet, Seizer of the Two Lands. The location of this capital is unknown, but is presumably near the city's necropolis, the present-day el-Lisht. Like Mentuhotep II, Amenemhet bolstered his claim to authority with propaganda. In particular, the Prophecy of Neferty dates to about this time, which purports to be an oracle of an Old Kingdom priest, who predicts a king, Amenemhet I, arising from the far south of Egypt to restore the kingdom after centuries of chaos.

Propaganda notwithstanding, Amenemhet never held the absolute power commanded in theory by the Old Kingdom pharaohs. During the First Intermediate Period, the governors of the nomes of Egypt, nomarchs, gained considerable power. Their posts had become hereditary, and some nomarchs entered into marriage alliances with the nomarchs of neighboring nomes. To strengthen his position, Amenemhet required registration of land, modified nome borders, and appointed nomarchs directly when offices became vacant, but acquiesced to the nomarch system, probably to placate the nomarchs who supported his rule. This gave the Middle Kingdom a more feudal organization than Egypt had before or would have afterward.

In his twentieth regnal year, Amenemhat established his son Senusret I as his coregent, beginning a practice which would be used repeatedly throughout the rest of the Middle Kingdom and again during the New Kingdom. In Amenemhet's thirtieth regnal year, he was presumably murdered in a palace conspiracy. Senusret, campaigning against Libyan invaders, rushed home to Itjtawy to prevent a takeover of the government. During his reign, Senusret continued the practice of directly appointing nomarchs, and undercut the autonomy of local priesthoods by building at cult centers throughout Egypt. Under his rule, Egyptian armies pushed south into Nubia as far as the Second Cataract, building a border fort at Buhen and incorporating all of Lower Nubia as an Egyptian colony. Senusret I also exercised control over the land of Kush, from the Second to the Third Cataract, including the island of Sai. The southernmost inscription containing Sesostris I's name has been found on the island of Argo, north of modern Dongola. To the west, he consolidated his power over the Oases, and extended commercial contacts into Syria-Palestine as far as Ugarit. In his 43rd regnal year, Senusret appointed Amenemhet II as junior coregent, before dying in his 46th.

The reign of Amenemhat II has been often characterized as largely peaceful, but records of his genut, or daybooks, have cast doubt on that assessment. Among these records, preserved on temple walls at Tod and Memphis, are descriptions of peace treaties with certain Syrio-Palestinian cities, and military conflict with others. To the south, Amenemhet sent a campaign through lower Nubia to inspect Wawat. It does not appear that Amenemhet continued his predecessors' policy of appointing nomarchs, but let it become hereditary again. Another expedition to Punt dates to his reign. In his 33rd regnal year, he appointed his son Senusret II coregent.

Evidence for military activity of any kind during the reign of Senusret II is non-existent. Senusret instead appears to have focused on domestic issues, particularly the irrigation of the Faiyum. This multi-generational project aimed to convert the Faiyum oasis into a productive swath of farmland. Senusret eventually placed his pyramid at the site of el-Lahun, near the junction of the Nile and the Fayuum's major irrigation canal, the Bahr Yussef. He reigned only fifteen years, which explains the incomplete nature of many of his constructions. His son Senusret III succeeded him.