From the company website:
One of the most important manufacturing worlds in the Inner Sphere, Hesperus II was a primary objective of the Word of Blake’s Operation STEEL HAMMER. The plan was designed to disrupt the Lyran Alliance’s economic and industrial base. Long before attempting to seize Hesperus II, the Word concocted a lengthy invasion plan to weaken Lyran defenses. The Blakists aimed to succeed where other invaders had failed.
Jihad Turning Points: Hesperus II fleshes out all the details of the conflict surrounding this pivotal world published in various Jihad Plot Sourcebooks. Additionally, players can join one of the myriad of units fighting for ultimate control of one of the Inner Sphere’s best-known factory worlds.