In London, matters came to a head in 1848 when the Chartists announced a mass rally on Kennington Common, south of the Thames. The fear was that they would work themselves into a froth of indignation, swarm over Westminster Bridge, and seize Parliament. Government buildings throughout the city were fortified in readiness. Lord Palmerston, the foreign secretary, blocked the windows of the Foreign Office with bound volumes of the Times. At the British Museum men were stationed on the roof with a supply of bricks to rain down on the heads of anyone who tried to take the building. Cannons were
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