Book excerpt: A study of medieval warfare and a formative event in the history of Britain. Edward I’s conquest of Wales has not been the subject of a scholarly book for over a century. Research has advanced since then, changing our perception of the medieval military mind and shining fresh light on the key characters involved in the conquest. That is why Sean Davies’s absorbing new study is so timely and important. Taking a balanced approach, he gives both the Welsh and English perspectives on the war and on the brutal, mistrustful, and ruthless personal motives that drove events. His account is set in the context of Welsh warfare and society from the end of Rome to the time of Edward’s opening campaign in the late thirteenth century. The narrative describes in vivid detail the military history of the conflict; the sequence of campaigns; Welsh resistance; Edward’s castle building and English colonization; the cost of the struggle to the Welsh and the English; and the uneasy peace that followed.