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 great southern dyke. But before beginning the perilous retreat he resolved to make a sortie to clear the road and build up the broken bridges.

Early the next morning the palace gate opened, and out dashed the cavaliers, scattering the dense ranks of the enemy. Behind came the Tlascalans dragging along with ropes three strange-looking machines. The Aztecs gazed with fear and curiosity. The monsters seemed to be square towers, two stories high, and they rolled heavily along on wheels. Suddenly from each of the machines doors dropped down, the muzzles of guns appeared, and both house-tops and street were swept with a withering fire. Then from the upper story ladders were flung out on to the roofs of the houses, and armed Spaniards springing across grappled with the astonished Aztec warriors, set fire to the buildings, and replacing the ladder returned to their tower of defence.

Down the long street went these mantas, leaving behind them a burning track. They were protected by a vanguard of cavalry and a rearguard of infantry, and in vain did Guatemozin strive to stop their progress. But at last they came to a palace so high that from its commanding roof the Aztecs could hurl with ease their clouds of missiles. Crash after crash struck the mantas, until at last they fell to pieces, and many of the men within were crushed to death. Abandoning the ruined machines, the Spaniards now found the way barred by a canal, and fierce was the fight ere they were able to restore the broken bridge. Seven canals cut the street to Tacuba, and at 187