The communication lines that the Japanese installed on the island had been laid shallowly and were destroyed in the naval bombardment, effectively preventing commander Keiji Shibazaki's direct control of his troops. In mid-afternoon, he and his staff abandoned the command post at the west end of the airfield, to allow it to be used to shelter and care for the wounded, and prepared to move to the south side of the island. He had ordered two of his Type 95 light tanks to act as a protective cover for the move, but a 5-inch naval artillery shell exploded in the midst of his headquarters personnel as they were assembled outside the central concrete command post, resulting in the death of the commander and most of his staff. This loss further complicated Japanese command problems.