Captain Thornby was a soldier of the Kul Tiras army led by Daelin Proudmoore in Warcraft III: The Frozen Throne.
Thornby was a villager of Lordaeron who offered to help Prince Arthas fight against the Bloodhill Bandits and the Blackrock orcs. He became a soldier in Arthas' army and helped the prince defeat the opponents of Lordaeron.
Thornby survived the Scourge 's invasion of Lordaeron and joined the Kul Tiras and became a guard of Daelin Proudmoore. During his time in the Kul Tiras, Thornby helped Admiral Proudmoore exterminate the orc population in Kalimdor. He was stationed near Vol'jin's base camp but was killed by Rexxar.