On the 15th of March 1948, the Northern Liberation Army invaded 15,000 people and attacked 18 cities in the city. On the 15th of March 1948, the Northern Liberation Army invaded Yangtze, Shenyang and Qingzhou. On the 28th of February 1947, the Northern Liberation Army invaded Yangtze and Qingzhou. On the 5th of January 1947, the Northern Liberation Army invaded Yangtze, Shenyang and Qingzhou. On the 15th of December 1947, the Northern Liberation Army invaded Yangtze. On the 28th of February 1947, the Northern Liberation Army invaded Yangtze and Qingzhou. On the 5th of January, the National Army of the Northern Liberation Army invaded Yangtze and Shenyang