?Boko Haram is finished? shouts a soldier, dancing and waving his rifle with his troops. The soldiers, from Niger, helped liberate the northern Nigerian town of Damasak from Boko Haram. Arabic graffiti painted on walls and Boko Haram?s black and white flag fluttering on the dome of a mosque are among the few reminders of the Islamists? four-month reign over the town, which forces from Chad and Niger freed...