Episode 01 of The Trigan Empire
Victory for the Trigans
Strijd om Trigië (Dutch title)
Battle for Trigan (Dutch title, translated)
Victory for the Trigans was originally published in 20 installments in issues 1 (18 September 1965) to 20 (29 January 1966) of Ranger magazine.
Plot summary at Nitcentral’s Bulletin Brash Reflections on The Trigan Empire