A mission to [Raven's Peak](link url) on [Eriadu](link url), executed by both [Clone Force 99](link url) and the [Partisans](link url) in resistance against the [Galactic Empire](link url), culminated in a bombing. While the two factions collaborated on this operation, their motivations for infiltrating Raven's Peak were different. The objective of Clone Force 99 was to find the location of [Doctor](link url) [Royce Hemlock](link url), as their brother [Crosshair](link url) was being held captive, whereas the Partisans sought to assassinate [Governor](link url) [Wilhuff Tarkin](link url).
Around [18 BBY](link url), a band of renegade [clone troopers](link url) attacked a [Gozanti-class cruiser](link url) within the [Balmorra system](link url). [Captain](link url) [Pearce](link url) was in command of the cruiser, but the clones managed to seize it, and [Echo](link url) retrieved its data logs. Echo then transported the logs to [Pabu](link url), with the hope that [Tech](link url) could decode the information. Tech was successful in his efforts, revealing to Clone Force 99 that Doctor Royce Hemlock of the Galactic Empire was conducting experiments on clones. Among these clones was [CT-9904](link url) "Crosshair," a previous member of Clone Force 99. Shortly thereafter, [Doctor](link url) [Royce Hemlock](link url) was unsuccessful in his interrogation of Crosshair at [Tantiss Base](link url), which prompted Crosshair to attempt an escape from [Mount Tantiss](link url).