«'Variorum [...] has made a signal contribution [...] by publishing the collected articles of DeVries...' Choice 'DeVries is amazingly prolific... DeVries, unlike so many specialists, especially specialists in the history of technology, is not carried away by the lure of his own specialism and has a clear understanding of the complexity of historical causation. This is really what makes this collection worthwhile.' Military History '... a fascinating collection... the whole is illuminating and thought-provoking. This volume belongs in the library of every university where medieval history is taught.' Technology and Culture '... it is extremely helpful to have the convenience of the assembled essays of prominent scholars.' The Ricardian»