BATTLE OF KOREA: No Stop

Soon after V-J day, proud U.S. cavalrymen raised a yellow and black billboard on the western outskirts of Tokyo. It read: "You are now entering Tokyo by courtesy of the 1st Cavalry Division—First in Manila; First in Tokyo—The First Team." As last week began, the dismounted troopers of the 1st Cavalry had every intention of adding "First in Pyongyang" to their battle honors.

Switching Signals. On the western flank of the U.N. army driving into North Korea, the cavalrymen advanced over the 38th parallel along the highway to Kum-chon, a railway center 80...