Sangheili-San 'Shyuum War (SoR)

The Sangheili-San 'Shyuum War was an interstellar war set between the sangheili and the San 'Shyuum races, over religious and technological differences. At the conclusion of the war, the Writ of Union was penned and initiated, and the Progeny was kindled.

Discovery
After leaving their homeworld in 2100 B.C.E, the San 'Shyuum encountered the Sangheili in 938 B.C.E, who also had experience with Forerunner technology. The San 'Shyuum believed that incorporating Forerunner technology was allowed by their religion. To the Sangheili, such a thing would have been unthinkable heresy.

War
During the combat, the Sangheili had an early advantage, with each warrior comparable in skill to several San 'Shyuum in battle. However, the San 'Shyuum's technological superiority, and possession of the Forerunner Dreadnought, meant that they had the advantage in space battles, using the Dreadnought to great effect in devastating hit-and-run strikes against the Sangheilian War Fleets. Eventually in 876 B.C.E, in order to ensure the survival of their race, the Sangheili were forced to amend their position of the treatment of Forerunner technologies and began studying their relics and incorporating elements into their warship, weapon and armor designs. The San 'Shyuum also realized that if there were other races with martial capabilities like the Sangheili, they would be in serious danger.

Battle of Occam's Rings
In the year, 865 B.C.E, the Sangheili were finally sucessful in their efforts to draw the San 'Shyuum fleet into a pitched battle. Due to an unusual solar fluctuation at the time of the battle, slipstream drives were inoperable for the majority of the battle.

The San 'Shyuum had marshalled their fleet, and sent it in a preemptive strike to destroy what they thought was a marshalling point for a Sangheili first strike on their homeworld. What they found was a Sangheili fleet that was ready and waiting for them, the fruits of a disinformation campaign against the San 'Shyuum. The San 'Shyuum tried to retreat, but they found that the magnetic fluctuations from the nearby second sun of the double sun system was interfering with their slipstream drive. With no other choice, they fought.

The battle was massive, one of the largest during the Sangheili-San 'Shyuum War, with the total amount of ships numbering in the hundreds. The San 'Shyuum still had the technological advantage, but the Sangheili more than made up for it with martial prowess. The battle lasted for a day and a half as the fight raged all overt the system. Casualities were large on both sides, as ships were blown to peices by plasma weapons, and both sides maneuvered for an advantage. Finally, it became obvious to the San 'Shyuum that they were going to lose this fight. They had lost over half of the force that they had brought with them, and their Forerunner Dreadnought had sustained heavy damage. Within a few hours, the magnetic fluctuations subsided, and the San 'Shyuum were able to limp away from the battlefied, their fleet a mere shell of itself. The Sangheili rejoiced in their victory. This battle had proved to them that they did not need to surrender to the San 'Shyuum, and that they could win in spite of the Forerunner Dreadnought. Unfortunately, it would be 27 more years before the war would end.