Uqba ibn al-Hajjaj's forces remained in Septimania and part of Provence for four years carrying raids to Lyons, Burgundy, and Piedmont. Charles Martel invaded Septimania in two campaigns in 736 and 739, but was forced back again to Frankish territory under his control. Alessandro Santosuosso strongly argues that the second (Umayyad) expedition was probably more dangerous than the first. The second expedition's failure put an end to any serious Muslim expedition across the Pyrenees, although raids continued. Plans for further large-scale attempts were hindered by internal turmoil in the Umayyad lands which often made enemies out of their own kind.