''John Humphries unearths the amazing story of Carel ap Rhys Pryce from his origins in south Wales, through his adventures in South Africa and America, where he eventually becomes generalissimo of the Magonista revolutionaries in Mexico. Apparently almost called "General Scallywag" the book is based on five years of personal research by Humphries that began after hearing an intriguing comment whilst on a visit to Alabama about a "Welsh guy . . . who caused a lot of trouble around the (Mexican) border". The Welsh guy (and Scallywag) in question was Carel ap Rhys Pryce, a distant descendent of none other than Owain Glyndŵr. Like his more famous ancestor, Pryce also had revolutionary tendencies. Humphries pieced together the story of how he lead a socialist army of mercenaries across the Sonoran dessert in 1911 to capture the border town of Tijuana, so alarming the US authorities that they sent 20,000 troops to the area.'