In the 14th year of his reign, an uprising occurred in the north. This uprising is most probably connected with the ongoing conflict between Mentuhotep II based in Thebes and the rival 10th Dynasty based at Herakleopolis who threatened to invade Upper Egypt. The 14th year of Mentuhotep's reign is indeed named "Year of the crime of Thinis". This certainly refers to the conquest of the Thinite region by the Herakleopolitan kings who apparently desecrated the sacred ancient royal necropolis of Abydos in the process. Mentuhotep II subsequently dispatched his armies to the north. The famous tomb of the warriors at Deir el-Bahari discovered in the 1920s, contained the linen-wrapped, unmummified bodies of 60 soldiers all killed in battle, their shroud bearing Mentuhotep II's cartouche. Due to its proximity to the Theban royal tombs, the tomb of the warriors is believed to be that of heroes who died during the conflict between Mentuhotep II and his foes to the north. Merikare, the ruler of Lower-Egypt at the time may have died during the conflict, which further weakened his kingdom and gave Mentuhotep the opportunity to reunite Egypt. The exact date when reunification was achieved is not known, but it is assumed to have happened shortly before year 39 of his reign. Indeed, evidence shows that the process took time, maybe due to the general insecurity of the country at the time: commoners were buried with weapons, the funerary stelae of officials show them holding weapons instead of the usual regalia and when Mentuhotep II's successor sent an expedition to Punt some 20 years after the reunification, they still had to clear the Wadi Hammamat of rebels.