- "You lack my gift for strategy and wealth of battlefield knowledge. I lack the abilities you’ve been granted with the Force. Now we can either be at odds for the rest of this war and be relegated to mediocre missions because our effectiveness suffers from a clash of pride, or we can work together and be truly formidable."
- — Reng Kasr to Hisani Sane
The Vanguard Fleet was formed during the Clone Wars to help the Galactic Republic strike deep into Separatist territory. During the Outer Rim Sieges it was one of the primary fleets leading the charge to liberate the vast swath of conquered worlds in that part of the galaxy.
It was commanded by Jedi General Hisani Sane and Vice Admiral Reng Kasr and saw numerous victories against the Separatist forces. The fleet would often be responsible for breaking through enemy lines so that other fleets could reinforce the position later.
The success of the fleet could be attributed to a mix of Kasr's ruthless tactical genius and Hisani's tempering influence to save as many Republic soldiers as possible. This odd combination meant that the clone troopers of the fleet tended to be some of the most experienced veterans in the war, comparable to the 501st Legion in terms of battle prowess.
The fleet was eventually disbanded after it was sent to reinforce Jedi General Yoda's forces at the Battle of Kashyyyk. Kasr purposefully sent the fleet's ships to ram into enemy vessels after the clones turned on him and Hisani during Order 66. Little remained of Vanguard after the battle, so it was retired during the Imperial restructuring following the rise of the Galactic Empire.