"Hidden Enemy, Part One of Three"
The events in this arc take place 19 years prior to Star Wars: A New Hope (concurrently with Star Wars: Episode III - Revenge of the Sith).
*The first issue of a three-part story that begins during the events of Revenge of the Sith, and reveals a battle that was not shown in that film!
The Separatist attack on the Wookiee homeworld of Kashyyyyk demands a strong response from the Republic, and Jedi Masters Luminara Unduli and Quinlan Vos arrive with their clone armies. But there may be more behind the Separatist attack-and more to the Wookiee's defense-than the Jedi know.
Old friends, new enemies, and lots of action! *Source: darkhorse.com