sentences:  In the fall of 2011, AMISOM forces, along with Kenyan and Ethiopian forces launched a set of offensive attacks on the al-Shabaab.In these attacks, AMISOM forces were able to reclaim key cities including the Somali capital of Mogadishu.In September 2013, Ethan Bueno de Mesquita, a political scientist, argued that with the help of AMISOM forces, they had made it "nearly impossible for al-Shabaab to hold territory even in its former strongholds in southern Somalia".