Operation: PROMETHEUS

Operation: PROMETHEUS was a high-risk mission ordered by the Office of Naval Intelligence. The mission took place on K7-49, a volcanic asteroid which served as a Covenant shipyard.

Background
K7-49 was discovered when the prowler was trying to probe an enemy ship during the Battle of New Harmony. They followed the ship through Slipspace and discovered the asteroid, along with a dozen partially constructed Covenant ships; an orbital shipyard. The volcanism on the planet is artificial; created by high-output plasma reactors that liquefy metallurgical components. They are then refined, shaped, and shipped away for final assembly.

The mission was for the SPARTAN-IIIs was to disable as many reactors possible so that the liquid contents of the facility would solidify and permanently clog their capacity to produce the metal.

History
At 0700, 300 SPARTAN-IIIs from Alpha Company landed. Initial resistance to the SPARTANs was light, and after two days, seven reactors had been deactivated before the Covenant organized a proper counterforce. However, the force was neutralized and over the next three days, Alpha Company destroyed 13 more reactors.

However, the Covenant soon arranged a massive counterforce, with the SPARTANs trading fire with Elites and Banshees. On the seventh day, more Covenant reinforcements arrived. The SPARTANs lost their unit cohesion in the battle, while the Elites took up superior positions with good cover. By then, 89% of the planet had cooled, enough for the Covenant shipyard to be shut down. The SPARTANs, however, were cut off from their Calypso exfiltration craft, preventing them from escaping.

Aftermath
Although K7-49 would no longer be used to build ships, every member of Alpha Company were killed in the fighting. Additionally, they paved the way for Beta Company, which had less mistakes in it then Alpha Company.

Timeline

 * On July 27, at 0700, 300 SPARTAN-IIIs land on K7-49.
 * On July 29, two reactors had been disabled. A counterforce had been arranged by the Covenant.
 * The Covenant force is neutralized. Over the next three days, 13 more reactors are destroyed. A massive attack force has been sent by the Covenant.
 * On August 2, additional Covenant reinforcements arrive. The asteroid has cooled enough for the ship-building operation to be canceled. Alpha Company was cut off from their extraction craft, preventing escape, and causing the deaths of all of them.

Trivia

 * Not all members of Alpha Company were killed in the battle. Carter-A259, Emile-A239, and Jun-A266 served with Noble Team as of August 2552.
 * The operation is an obvious allusion to the Battle of Thermopylae. 300 Spartans were present at both battles, both were suicide missions, both were fought in order to slow the enemy down enough for the respective sides to prepare and survive longer, and both resulted the deaths of all Spartan combatants.