On January 15, the tide began to turn. Operation Wolfhound began with the 27th Infantry Regiment beginning a modest counteroffensive that took them almost halfway to back to Seoul. It was clear that the Chinese were weakened and overextended. On January 25, the 8th Army launched Operation Thunderbolt. This drive drove the Chinese all the way back to the Han River. The UN once again took control of Inchon, as well as Kimpo Airport, south of Seoul. In the process, the Army, together with the Airforce, was very effective in killing large numbers of Chinese soldiers.