For several hours, Israel held its collective breath: The military’s top lawyer had disappeared two days after she resigned amid a legal inquiry into her role in exposing an explosive prisoner abuse scandal. The former military advocate general, Maj. Gen. Yifat Tomer-Yerushalmi, sparked a frantic police search amid fears for her well-being in a case that consumed the country while striking at the heart of deep divisions over the U.S. ally’s conduct in its war in Gaza. Although she was found safe hours later, she was subsequently arrested Sunday for her role in the leak of a video showing alleged...