<P><B>''Robert Verkaik makes a revisionist case for an unsung aircraft, the Boulton Paul Defiant. This two-seat gun-turret fighter is, argues Verkaik, the forgotten fighter of Dunkirk and the Battle of Britain; the effectiveness as well as the courage of its crews is overlooked in standard accounts. To advance his case, he notes that a Defiant squadron still holds the record for the number of enemy aircraft shot down in a single day, with a claimed figure of 38''</B><br><B><I>Times</I></B><br><B><br>''Robert Verkaik tells the story of the Battle of Britain''s unlikeliest hero with verve and phenomenal grasp of detail. He brings the Defiant fighter back into focus as an important part of the victorious RAF in the hour of its greatest trial''</B><br><B>Mark Urban</B><br><B><br>''Meticulously researched and rich in human and social as well as military interest, <I>Defiant</I> fills a crucial gap in our understanding of that most perilous time''<br>David Kynaston, author of <I>Austerity Br