Thunderstorm on Valian II

The Thunderstorm on Valian II was a xenocidal campaign of retribution conducted by the Sons of Iron Space Marine Chapter against an invading Ork WAAAGH! that was assailing the Imperial agri-world of Valian II.

History
The Sons of Iron answer a call for help from the agri-world of Valian II, near their Suami's homeworld. There, they discover this world infested by greenskins. Facing a world nearly beyond redemption, the then-Captain of the 5th Company, Yaren Oldrak chooses to bombard the planet. For three days, the massive concentrations of Orks suffer under heavy fire. At the morning of the fourth day, the 5th Company launch a deadly attack against the Warboss fortress, using their Drop Pods en masse. It is the first use of their renowned battle tactic when launching a campaign. The remaining four years are used to totally eradicate the Orks from Valian.