The driver in the lead jeep held up his hand, and the long convoy ground to a halt. A hard, efficient-looking officer stepped out of the jeep. From the star on either shoulder, Micheals knew he was a brigadier general. "You can't block this road," the general said. He was a tall, spare man in suntans, with a sunburned face and cold eyes. "Please clear that thing away." "We can't move it," Micheals said. He told the general what had happened in the past few days. "It must be moved," the general said. "This convoy must go through." He walked closer and looked at the leech. "You say it can't be jacked up by a crowbar? A torch won't burn it?" "That's right," Micheals said, smiling faintly. "Driver," the general said over his shoulder. "Ride over it." Micheals started to protest, but stopped himself. The military mind would have to find out in its own way. The driver put his jeep in gear and shot forward, jumping the leech's four-inch edge. The jeep got to the center of the leech and stopped. "I didn't tell you to stop!" the general bellowed. "I didn't, sir!" the driver protested. The jeep had been yanked to a stop and had stalled. The driver started it again, shifted to four-wheel drive, and tried to ram forward. The jeep was fixed immovably, as though set in concrete. "Pardon me," Micheals said. "If you look, you can see that the tires are melting down." The general stared, his hand creeping automatically toward his pistol belt. Then he shouted, "Jump, driver! Don't touch that gray stuff." White-faced, the driver climbed to the hood of his jeep, looked around him, and jumped clear. There was complete silence as everyone watched the jeep. First its tires melted down, and then the rims. The body, resting on the gray surface, melted, too. The aerial was the last to go. The general began to swear softly under his breath. He turned to the driver. "Go back and have some men bring up hand grenades and dynamite." The driver ran back to the convoy.