With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: Confucius desired to return the authority of the state to the duke by dismantling the fortifications of the city—strongholds belonging to the three families. This way, he could establish a centralized government. However, Confucius relied solely on diplomacy as he had no military authority himself. In, Hou Fan—the governor of Hou—revolted against his lord of the Shu family. Although the Meng and Shu families sucessfully besieged Hou along with a loyalist official, Hou Fan rose up with the people and made them flee to the Qi state. The situation may have been in favor for Confucius as this likely made it possible for Confucius and his disciples to convince the aristocratic families to dismantle the fortifications of their cities. Eventually, after a year and a half, Confucius and his disciples succeeded in convincing the Shu family to raze the walls of Hou, the Ji family in razing the walls of Bi, and the Meng family in razing the walls of Cheng. First, the Shu family led an army towards their city Hou and tore down its walls in.
text_B: Did the Meng and Shu have any help in their siege of Hou?
YES.