16-17; Jacobs 2002, p. 5). The bulk of the heavy lifting, though, was performed by a large labour force.
Although the way the labour force was raised is uncertain (Romer 2007, p. 133), the graves of the workers have been excavated. The Upper Cemetery at Giza, near the 'Wall of the Crow' to the southeast of the Sphinx, contains the tombs of the workers. The male and female bodies discovered in the tombs have evidence of stress related to carrying heavy objects; yet they also prove that highly skilled physicians worked on these people, as there is evidence of people living for years after brain surgery, broken bones and amputation (Hawass 2004, pp. 22-23). Although, according to Lehner, their lives were based on a feudal system, they lived in the Giza city which was well equipped to feed the workers (Shaw 2003, pp. 47-49 & 99) and look after their daily needs. Jacobs (2002, p.4) calculates that 20,000-30,000 workers would be on site at once. Graffiti shows that the workers themselves were split into crews of 2,000. The crews were then divided into two gangs, and then into five tribes. Ganges had their own names (Shaw 2003, p. 99), some of which have been found graffitied in hidden places in the Great Pyramid (Hawass 2009, p. 15). These people were highly valued workers, who used both their skills and bodies towards building an everlasting