 Complete the following phrase:  In 1937, though still not completely trained and fully equipped with German weapons, the 88th Division under the command of Sun Yuanliang was rushed to the Second Battle of Shanghai alongside the other German-trained divisions. The elite, German-trained division performed admirably, pushing the Japanese marines back to the very shores of Shanghai. While the Chinese Air Force provided much air-interdiction and close-air support , pressing demands for air force units in the northern front at the Battle of Taiyuan and southern front at 