 In September 1932 during the Second Feng Chan-hai Subjugation Operation a force of 7,000 Manchukuoans cornered the now 10,000 men Volunteer force "bandits" of Feng retreating from the previous attack.Although surrounded, over half the guerrillas were able to slip through the encirclement and make good their escape to Jehol.Later Feng's force joined in opposing the invasion of Jehol, and was forced to draw back into the area inside the Great Wall.