Some Protestant advocates of an alternative site claim that a wall would imply the existence of a defensive ditch outside it, so an earlier wall could not be immediately adjacent to the Golgotha site, which, combined with the presence of the Temple Mount, would make the city inside the wall quite thin. Essentially, for the traditional site to have been outside the wall, the city would have had to be limited to the lower parts of the Tyropoeon Valley, rather than including the defensively advantageous western hill. Since these geographic considerations imply that not including the hill within the walls would be willfully making the city prone to attack from it, some scholars, including the late 19th century surveyors of the Palestine Exploration Fund, consider it unlikely that people would build a wall that cut the hill off from the city in the valley. However, archaeological digs within the Church of the Holy Sepulchre proved the existence of six graves from the first century on the area of the church, placing it outside the city area and casting doubt on the Strategic Weakness and Defensive Ditch hypotheses.