[The Conversation Africa] Chad recently ordered the German ambassador to the country, Dr Gordon Kricke, to leave within 48 hours, accusing him of disrespectful behaviour and disregard for diplomatic protocol. In retaliation, Berlin expelled the Chadian ambassador to Germany. Helga Dickow, a political scientist and expert on Chad, explains the link between the diplomatic tit-for-tat and the now delayed Chadian transition to constitutional rule.