How were medieval navies organised, and how did powerful rulers use them? This fascinating account brings vividly to life the dangers and difficulties of medieval seafaring. 'This excellent book, by the quality of the analysis and the richness of the documentation, is a precious 'reading companion' for every maritime historian and archaeologist.' - Nautical Archaeology'It is short, stimulating, and suffused with examples of how warships were deployed during the Middle Ages ... Susan Rose makes incisive comments throughout about the uses and limitations of medieval seapower.' - English Historical Review