 The king assigned Wu Zixu to lead the design and building of his "great city," which forms the basis of Suzhou's present old town.In 506 BC, Helü with the help of Wu Zixu and Sun Tzu, the author of "The Art of War", launched major offensives against the state of Chu.They prevailed in five battles, one of which was the Battle of Boju, and conquered the capital Ying.