NAIROBI, Kenya - Ethiopia is prepared to invade neighboring Somalia to defend its U.N.-backed government against what appeared to be an imminent attack by Islamic militiamen, a government spokesman said Wednesday. The militiamen, who hold most of southern Somalia, deployed hundreds of fighters outside the town where the largely powerless government is based and said they planned to seize it. "We have the responsibility to defend the border and the Somali government. We will crush them," Ethiopia's Minister of Information, Berhan Hailu, told The Associated Press. Seizing the town of Baidoa would give the Islamic militia — which the United...