Recently on HBO’s Game of Thrones, Jaime Lannister (the Kingslayer) sought to capture Riverrun, a castle commanded by Brynden Tully (the Blackfish). Sir Jaime headed a large force, but Riverrun boasted a deep moat and high walls making a head-on attack foolhardy. What to do? Sir Jaime laid siege, a tactic as old as warfare.…

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