Stampede of the Attilans

The Stampede of the Attilans was an Imperial defensive campaign carried out by multiple Astra Militarum Regiments including: Parakonian Thunderhooves,Attilan Rough Riders,Tallarn Desert Raiders and the Vostrayn First Born - as well as vessels from the Imperial Navy, to halt an encroaching Tyranid Splinter Fleet.

Background
During a particularly large deployment of multiple Attilan Rough Riders, Vostroyan Hussars and Tallarn Desert Raiders to the world of Ygrivve on the western fringes of the galaxy that was under threat from a Tyranid splinter fleet, roughly a dozen Parakonian Thunderhooves regiments were also requisitioned to ensure the xenos paid dearly for every inch of ground taken. As several Imperial Navy battlegroups drove off the xenos fleet in orbit, the Rough Rider regiments and Parakonians led one of the largest cavalry charges in imperial history. It is estimated roughly 400 regiments both human and abhuman took part in the attack and the number of soldiers involved vary wildly depending on the reports of each organisation, the largest number being roughly 11.9 million and the smallest 800,000.

The charge was carried for an astonishing distance of 10 miles and while it was expected the cavalry would be all but destroyed, artillery support from several supporting regiments, aerial support from the navy in orbit as they cleared the gravity well and heavy fire from the light autocannons of the Parakonians softened the tyranids enough to ensure that by the time the charge lost it's momentum the enemy had no chance of re-establishing a defendable base of operations. Quite frankly it is believed that moniker of the battle belongs to the Attilans because there were some still standing after leading at the tip of the charge.