Defence of the Zephyron System

The Defence of the Zephyron System was an Imperial defensive campaign carried out by the Paladins of Thunder Space Marine Chapter against a large-scale invasion by the Forces of Chaos during the latter years of the Indomitus Crusade, to defend their home system.

History
After a big warp storm hitted the system, a Space Hulk appeared in the edge of the system. But, two days later, a massive Chaos insurrection happened in Zephyron III and the once still "Space Hulk" turned out to be a warband of the Alpha Legion. During the months of their siege to both planets, the local regiments and the 5th and 9th Companies held their ground even until both the Crimson Fists and the 1st Company of the chapter arrived. Before this siege, the Strike Cruiser Dorn's Pride (now known as the Fury of Zephyron), was emptied of equipment to carry as much of the population of Zephyron IV as possible out of the system, as well as to carry a message to allied forces nearby (the ship that had to carry that duty, the Nova Frigate Indomitus, was destroyed protecting the Dorn's Pride).