historians, beginning with the Mozarabic Chronicle of 754, stressed the macrohistorical impact of the battle, as did the Continuations of Fredegar. This became a claim that Charles had saved Christianity, as Gibbon and his generation of historians agreed that the Battle of Tours was unquestionably decisive in world history. Modern historians have essentially fallen into two camps on the issue. The first camp essentially agrees with Gibbon, and the other argues that the Battle has been massively overstated – turned from a raid in force to an invasion, and from a mere annoyance to the Caliph to a shattering defeat that helped end the Islamic Expansion Era. It is essential, however, to note that within the first group, those who agree the Battle was of macrohistorical importance, there are a number of historians who take a more moderate and nuanced view of the significance of the battle, in contrast to the more dramatic and rhetorical approach of Gibbon. The best example of this school is William E. Watson, who does believe the battle has such importance, as will be discussed below, but analyzes it militarily, culturally, and politically, rather than seeing it as a classic "Muslim versus Christian" confrontation. In the East, Arab histories followed a similar path. First, the battle was regarded as a disastrous defeat; then, it largely faded from Arab histories, leading to a modern dispute which regards it as either a second loss to the great defeat of the Second Siege of Constantinople, where the Bulgarian Emperor Tervel played a crucial role, or a part of a series of great macrohistorical defeats which together brought about the fall of the first Caliphate. With the Byzantines and Bulgarians together with the Franks both successfully blocking further expansion, internal social troubles came to a head, starting with the Great Berber Revolt of 740, and ending with the Battle of the Zab, and the destruction of the Umayyad Caliphate. In Western history The first wave of modern historians, especially scholars on Rome and the medieval period, such as Edward Gibbon, contended that had Charles fallen, the Umayyad Caliphate would have easily conquered a divided Europe. Gibbon famously observed: Nor was Gibbon alone in lavishing praise on Charles as the savior of Christendom and western civilization. H. G. Wells wrote: "The Moslim when they crossed the Pyrenees in 720 found this Frankish kingdom under the practical rule of Charles Martel,