Siege of the Inner Colonies

The Siege of the Inner Colonies was the series of engagements taking place in humanity's Inner colonies that made up the late Human-Covenant War.

Battle
From June 1, 2536 onwards, the Covenant would press into the Inner Colonies.

Eight years afterward, the Inner Colony of Miridem would fall to the Covenant. This would eventually result in the capture of Catherine Halsey. In May 2545, Actium was discovered by the Covenant, resulting in the month long Battle of Actium.

In May of 2552, the colonies of Troy and Harmony in the Hellespont system were attacked.

Attacks in the Epsilon Eridani system
On July 23, 2552, the Fleet of Valiant Prudence deployed Sangheili Zealots to disable the Visegrád Relay, effectively cutting Reach off from the UNSC.

By August 30, 2552, nearly a dozen Inner Colony worlds were passed over by the Covenant in order to attack Reach.

Aftermath
A number of Inner Colonies managed to survive the war.

The Lesser Ark
The joint UNSC and Sangheili forces were deployed to the Ark after discovering the portal.

2544

 * The Third Fleet of Glorious Consequence attacks Miridem.

2545

 * A month long campaign on Actium takes place between the Covenant and UNSC.

2547

 * Skopje is attacked by the Covenant.

2552

 * May: The Massacre of Troy in the Hellespont system takes place.
 * July 25: The Visegrád Relay is taken down by Covenant Zealots, beginning the Fall of Reach.
 * Mare Erythraeum is attacked by the Covenant.

Unknown

 * Imber is attacked by the Covenant. Operation: DEVIL FREEDOM takes place there.
 * Ballast is attacked at an unknown point.