The Battle of Castobel
Desert of Cressos Majoris
The upland to Hive Cressos is a mountainous rock desert with gorges and craters. This is also where the massive Hive Fleet Dagon entered the planet and began its invasion of Castobel.
Due to relatively hostile enviroment encountered in the desert and radiation pools scattered about the badlands of the planet, the tyranid invasion has been severely halted by imperial forces, and Castobel seems to be ridding itself of the final node creatures, no small feat accomplished by the unrelenting assault of Imperial Guard and Navy forces centered around the planet, and surgical precision strikes completed by the Adeptus Astartes of the Deathwatch.