KABUL, Afghanistan — Suicide bombers and gunmen staged a pre-dawn attack Monday near a hilltop military academy, killing at least 11 Afghan soldiers and wounding 16 more, in a battle that continued through the morning rush hour, officials said. It was the latest high-profile insurgent attack in Kabul in the past week, which has been marked by an unprecedented spate of violence in Afghanistan’s war-torn capital. Defense and police officials said insurgents assaulted an army unit guarding the heavily fortified Marshal Fahim military academy, first detonating a bomb and then attacking with rockets, gunfire and hand grenades.