Oscar Newman introduced defensible space theory in his 1972 book "Defensible Space". The student becomes responsible for thinking about the disagreements and reaching a reasoned, defensible conclusion. The killings were not rational means to an end that was partly defensible. Bastion forts arose in an attempt to make cities defensible against strengthening military firepower. The natural fortification made Kamakura an easily defensible stronghold. Their conclusion was that a few large convoys are more defensible than many small ones. The military garrisons usually lacked defensible walls but were seldom attacked. They also deemphasised less effective aspects of defensible space. Beyond that, a priority is situation on isolated, defensible terrain. Public opinion demanded it to humiliate France, and the Army wanted its more defensible frontiers. Nevertheless, they had the advantages of good defensible terrain and superiority in artillery. He returned to the company perimeter and ordered a withdrawal to a more defensible position. General Gage turned his attention to fortifying easily defensible positions. Its philosophy is largely based on New Urbanism and the concept of defensible space. This evidently derives from the site's position atop an easily defensible plateau.