premise: "They will go back very soon, almost 80 percent of our mission is completed ... There were common interests, they (the Islamists) were threatening us and also threatening Ethiopia."
  In June, the Islamists seized Mogadishu and much of Somalia, leaving the US-backed transitional government only in control of the town of Baidoa.
  But as the Islamists advanced on Baidoa, Ethiopia moved to shore up the government. Heavy fighting then erupted last week after the Islamists made good on a vow to launch attacks if Ethiopian troops failed to pull out within a week.
   What left the transitional government only controlling Baidoa?
hypothesis: Ethiopian troops failed to pull out within a week