Art of War 2.12

Cf. Mencius VII. 2. xiv. 2, where 丘民 has the same meaning as 丘役. 丘 was an ancient measure of land. The full table, as given by 司馬法, may not be out of place here: 6 尺 = 1 步; 100 步 = 1 畝; 100 畝 = 1 夫; 3 夫 = 1 屋; 3 屋 = 1 井; 4 井 = 1 邑; 4 邑 = 1 丘; 4 丘 = 1 甸. According to the Chou Li, there were nine husbandmen to a 井, which would assign to each man the goodly allowance of 100 畝 (of which 6.6 now go to an acre). What the values of these measures were in Sun Tzŭ’s time is not known with any certainty. The lineal 尺, however, is supposed to have been about 20 cm. 急 may include levies of men, as well as other exactions.