Two and a half years ago, South Korean and American forces were conducting live-fire drills in the sea west of Korea near the island of Yeonpyeong when a cable from North Korea arrived asking if the drills were an attack. South Korean and American forces proceeded with the drills, firing south into the sea, away from North Korea. The North attacked, shelling Yeonpyeong and killing four South Koreans, including two civilians. The South returned fire and scrambled fighter jets. It seemed the peninsula was on the brink of war.