The words "he" and "his" in these verses refer to Nebuchadnezzar, the king of Babylon, and represent the soldiers in Nebuchadnezzar's army doing these actions. The word "your" refers to the city of Tyre. Yahweh continues giving Ezekiel his message to Tyre.
"Battering rams" are large trees or poles that many men in an army would pick up and hit against a wall or door so they could break it down and get inside. See Ezekiel 4:2.