After the release of Gohan's book, "Groundbreaking Science", which informed the general public of advanced martial arts, the people of Earth took great interest in fighting. Some specifically gained interest in the theory of channeling ki energy through swords to increase the speed and power of strikes because of the book's article "Katchin Can Be Cut!". This article reveals that the dense material Katchin can be cut, which greatly intrigue Trunks and Goten. "Swordsmanship is cool, isn't it. Let's set up an awesome school all by ourselves!", the two become enthralled by this motivation. Via intense training, the two are able to develop their natural potential and, as adults, found the Kikoukenjutsu Sword School to educate the planet's new generation of warriors.
In Age 820, remnants of the Frieza Force attack Earth and the Kikoukenjutsu Sword School is reported to play a major role in their defeat; being the only major fighting school established until a year later when Krillin and Tien's schools are founded. The Kikoukenjutsu Sword School still exists as of Age 1000 and is one of the most notable martial arts schools on the planet. Using their schools sword techniques, Goten & Trunks were able to overcome the Frieza Force's army of Jigglers (the same alien species as the Red Ribbon Army's monster Buyon that Goku had fought during his assault on Muscle Tower in the past) which the Frieza Force had deployed to counter physical attacks by Earthling Martial Artists.
It should be noted that swordsmanship itself predates the foundation of the Kikoukenjutsu Sword School, as shown by various characters such as the Bear Thief, Yamcha, Chi-Chi, Ninja Murasaki, Pirate Robot, Mercenary Tao, Yajirobe, Gohan, Future Trunks, Kogu, Dabura, and Janemba. King Cold demonstrates being somewhat familiar with swords and briefly wields Future Trunks' sword before his death. In Supersonic Warriors 2, Future Trunks states he learned swordsmanship from Future Gohan who had learned to wield a sword during his training under Piccolo during Saiyan conflict.
North Supreme Kai was a swordsman in the 5 Million Before Age. The Konatsian Wizard and his two students Tapion and Minotia where swordsmen in 226 Before Age. In Dragon Ball Online, some of the Frieza Force's Vewonean and Sinkleean soldiers wield Laser Swords. In Dragon Ball Fusions, the Frieza Force veteran Dodoria's race member Caluppa is a master swordsmen capable of wielding both physical swords and energy blades who has served within the army since the days of the Cold Force.
In Dragon Ball Heroes, the Xeno World incarnation of Future Trunks, Xeno Trunks is a swordsman and Time Patroller. Additionally, Future Gohan and Future Trunks' fusion Future Gohanks is also a swordsman like his fusees who wields Future Trunks' sword. Future Gohanks counterpart Xeno Gohanks is also a swordsman who wields Xeno Trunks' sword. Additionally, Xeno Gotenks inherits Xeno Trunks' knowledge of swordsmanship. Gohan (Supreme Kai Clothes) can wield the Z Sword as a weapon in Dragon Ball Heroes. Additionally in the game version of the Dark King Mechikabura Saga, Xeno Bardock briefly wields Xeno Trunks' discarded Key Sword to defeat Dark Broly. Other swordsmen in Dragon Ball Heroes include Demon God Salsa, Xeno Janemba, Dark Demon God Xeno Majin Buu (as a result of his absorption of Demon God Dabura and Xeno Janemba), & Fu.