Kurdish forces in northern Iraq are drawing up plans to break Islamic State’s siege of Sinjar mountain, where hundreds of minority Yazidis remain stranded months after fleeing their homes.

Seeking to regain territory and repair pride in his military forces, Masoud Barzani, president of Iraq’s semi-autonomous Kurdish region, is overseeing efforts to retake the mountain, senior party members said.

Islamic State attacked the Sinjar area in August, sending thousands of Yazidis fleeing up the mountain, a craggy strip some 40 miles (65 km) long. […]