Shortly before the Battle of Hoth, which occurred in 3 ABY, a military operation unfolded on Culroon III. This conflict pitted the forces of the Galactic Empire against the Culroonians, the indigenous people of Culroon III, and was sparked by an uprising. The human male Maximilian Veers participated in this military operation representing the Empire, where he displayed exceptional bravery, strategic thinking, and leadership skills. His innovative tactics secured an Imperial triumph. As a result of his performance, Veers was eventually elevated to the rank of general within the Imperial Army. His achievements also caught the attention of the Sith Lord Darth Vader, who specifically requested Veers be assigned to his elite Death Squadron. This military operation was referenced within Veers' biography in the Galactic Explorer's Guide, a work authored by the pirate Hondo Ohnaka in collaboration with his protocol droid DK-RA-43 following the Battle of Starkiller Base in 34 ABY.
A veiled reference to the Culroon III conflict can be found within canon in Adam Gidwitz's 2015 children's book, So You Want to Be a Jedi?. This book is a reimagining of the 1980 film Star Wars: Episode V The Empire Strikes Back. The Star Wars: The Galactic Explorer's Guide, a 2019 reference book penned by Jason Fry, explicitly refers to it as a military operation.
Within the Star Wars Legends continuity, the Insurrection on Culroon III involved the Empire and the native Culroon inhabitants of the planet Culroon III. This event was depicted in a short story titled "The Promotion of Lieutenant Veers," featured in The Star Wars Sourcebook by Bill Slavicsek and Curtis Smith, published in 1987. The story details how Maximilian Veers was promoted from lieutenant to major after securing victory for the Empire. Veers' StarWars.com databank entry, which was available by 2001, identified this event as the insurrection on Culroon III.