"Operation Hammer"@en . "Operation Hammer was a series of Blood Covenant offensives against the United Nations Space Command and the Sangheili Armed Forces during the War of Vengeance in early 2557."@en . . . . "Operation Hammer was a series of Blood Covenant offensives against the United Nations Space Command and the Sangheili Armed Forces during the War of Vengeance in early 2557."@en . . . . .