He jumped over its craggy edge and walked to its centre. There he selected a high place, and with his hands he cleared away the growth that covered it. Next he laid the foundations of a fort, over which he was to watch the fastnesses for imaginary enemies. The foundations were made of boulders. Some he carried and some he rolled from the floor of the man-made canyon. By the end of the afternoon he had laid out a square wall of rock some three feet in height. On the next day he added to it until the four walls reached as high as he could stretch. He left space for one door and he made a single window. He roofed the walls with the trunks of trees and he erected a turret over the door. For days the creation was his delight. After school he sped to it. Until dark he strained and struggled with bare rocks. When it was finished, it was an edifice that would have withstood artillery fire creditably. Then Hugo experimented with catapults, but he found no engine that could hurl the rocks he used for ammunition as far as his arms. He cached his treasures in his fortress—an old axe, the scabbard of a sword, tops and marbles, two cans of beans for emergency rations—and he made a flag of blue and white cloth for himself. Then he played in it. He pretended that Indians were stalking him. An imaginary head would appear at the rim of the pit. Hugo would see it through a chink. Swish! Crash! A puff of dust would show where rock met rock—with the attacker's head between. At times he would be stormed on all sides. To get the effect he would leap the canyon and hurl boulders on his own fort. Then he would return and defend it. It was after such a strenuous sally and while he was waiting in high excitement for the enemy to reappear that Professors Whitaker and Smith from the college stumbled on his stronghold. They were walking together through the forest, bent on scaling the mountain to make certain observations of an ancient cirque that was formed by the seventh great glacier. As they walked, they debated matters of strata curvature. Suddenly Whitaker gripped Smith's arm. "Look!" They stared through the trees and over the lip of Hugo's mine. Their eyes bulged as they observed the size and weight of the fortress. "Moonshiners," Smith whispered. "Rubbish. Moonshiners don't build like that. It's a second Stonehenge. An Indian relic." "But there's a sign of fresh work around it."