“A determined but often chaotic uprising by clan militias supported by Somali government troops has forced the al-Shabab militant group, one of al-Qaeda’s wealthiest and strongest global affiliates, onto the back foot, say Somali and U.S. officials. Political infighting in the Somali government had stymied any military offensive against al-Shabab for the past three years, allowing the group to consolidate its control over parts of Somalia. But after elections were held in May and the new government put its backing behind some of the clans in central Somalia, their militias began to claw back territory, taking over insurgent checkpoints previously used to extort money and bases used to launch attacks. “What we’re seeing is really large scale combat operations taking place in Somalia and incorporating the clans in a way that we just have not … seen,” said Rear Adm. Milton Sands, who heads U.S. Special Operations Command Africa, in an interview. “I’m really optimistic.” Clan militias have fought the insurgency before, but it is the first time they have had such extensive military backing, and that support is now encouraging many aggrieved Somalis to join the militias and fight. “I’ve been in and out of Somalia for 13 years, and I’ve never seen the federal government, member states and clans all angry and so united to finish al-Shabab,” said Gen. Keith Katungi, the acting force commander of the African Union peacekeeping force. “This is the first big Somali-led offensive.”