"Instantly close in on your opponent and cut them down to size with your sword."
The Konatsian Wizard's usage of this attack to defeat Hirudegarn is mentioned in the movie Dragon Ball Z: Wrath of the Dragon. Also in Wrath of the Dragon, using Tapion's sword, Trunks performs a similar attack to cut of Hirudegarn's tail.
Appearances in games
Brave Sword Attack was named in the Budokai Tenkaichi video game series and Dragon Ball Heroes, used by Tapion as his Ultimate Blast. This attack is one of the three rushes to be able to attack giant characters in the Budokai Tenkaichi series; the other ones being Yajirobe's Miracle Ka-Blam Slash and Goku's Dragon Fist. Both the Brave Sword Attack and the Dragon Fist were used against the giant enemy Hirudegarn in Wrath of the Dragon.
In Dragon Ball Xenoverse 2 as part of the Extra Pack 1 DLC, it appears as one of Tapion's Ultimate Skills. It can also be obtained by the Future Warrior (Xenoverse 2) as a reward in Parallel Quest 117: "A Dance of Swords" which is randomly dropped by Tapion when he is defeated during an Ultimate Finish. In Xenoverse 2, rapid movement is added in place of the running dash causing the attack to be faster and gives it surprisingly greater range for a melee attack. If the Brave Sword Attack hits a Great Ape it can cause damage though it can be tricky to actually land hit them with it as the rapid movement part of the technique apparently isn't programmed correctly to move into the correct range to damage them, thus the user has to perform the move at close quarters to actually hit a Great Ape.