After Nurhachi was in Khan's position, Jin Ming fought three major battles: the battle of Salhu, and the Ming Dynasty lost the power of active attack militarily and was forced to be on the defensive. The battle between Liaoning and Shenyang captured Shenyang and Liaoyang, and more than 70 cities east of Liaohe. After the war, Nurhachi moved to Shenyang. The battle of Ningyuan broke the myth that Nurhachi had been invincible since he started his army. Therefore, the correct answer is B.