Irreplaceable, by Jason Hansa, was published online on BattleCorps in two parts on 05 and 09 October 2009, respectively. It was also later published in print as a single story in the 2016 BattleCorps anthology Front Lines.
Set around the Battle of Halstead Station, it gives insights into what drove Hanse Davion, later known as the "Victor of Halstead Station", when he had just inherited the throne of the Federated Suns from his brother Ian and how bitter the victory on Halstead Station was for him, setting the stage for the later evolution of his character.
