Randall Moffett's paper 'Military Equipment in the Town of Southampton During the Fourteenth and Fifteenth Centuries' in the Jounral of medieval Military History, volume 9 (2011) refers to Liebel's book on springalds and great Crossbows, saying that Liebel makes a very good case for the one-foot/two-foot distinction being a reference to the length of the bolt.
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