Battle of Midpoint
A massive Eldar fleet threatened to destroy the space docks of Midpoint in the Argonnes Sector, resulting in local Imperial Navy defenders struggling to fight back the agile Xenos ships. However the sudden appearance of The Rock and the Dark Angels' Swordfleet tipped the balance in the Imperium's favor. The Eldar retreated, but not before the firepower of The Rock annihilated their capital ship and a half dozen vessels of their armada. To this day, the hulks and corpses of both sides still float in the void of space outside Midpoint station.