One of Mathews'more unusual ideas, with which he experimented in early 1939, was to stack piles of football-sized concrete spheres on top of air-raid shelters, with the intention that a bomb would expend its energy in scattering aside the heavy spheres rather than breaking the shelter.
2.
Engineers in Mongol service displayed a considerable degree of ingenuity and planning; during a siege of a fortified Chinese city the defenders had taken care to remove all large rocks from the region to deny the Mongols an ammunition supply for their trebuchets, but the Mongol engineers resorted to cutting up logs which they soaked in water to make suitably heavy spheres.
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