US and Afghan troops fought off coordinated insurgent attacks in eastern Afghanistan, leaving a dozen militants dead and a dozen more wounded, the US military said Monday. As many as 40 insurgents attacked five military outposts Sunday in the Korangal Valley of volatile eastern Kunar province, using small arms fire, rockets and mortars, the military said in a statement. The joint force returned fire and called in airstrikes that left 12 militants dead and 12 others wounded, the coalition said. No US or Afghan soldiers were hurt. The Korangal Valley is one of the most volatile areas in Afghanistan. Korangal's high mountains - densely wooded and riddled with caves - are used by militants to launch near-daily attacks on remote US bases.