The 3rd Brigade represented a brigade within the structure of the Grand Army of the Republic. The Hawkbat Battalion, a component of the 3rd Brigade, participated in many conflicts at the commencement of the Clone Wars, a widespread galactic war that pitted the Galactic Republic against the Separatist Alliance. Initially, the battalion was under the command of various Jedi Generals such as Kit Fisto, Obi-Wan Kenobi, Even Piell, Anakin Skywalker, Saesee Tiin, Mace Windu, and Yoda.
The Grand Army of the Republic included the 3rd Brigade as one of its brigades. The Hawkbat Battalion, a unit belonging to the brigade, also belonged to the 101st Regiment. Both the 3rd Brigade and the battalion operated under the 7th Legion of the 327th Star Corps'.
Early in the Clone Wars, the Hawkbat Battalion of the 3rd Brigade was involved in a number of battles. The First Battle of Geonosis, which started the galactic conflict between the Galactic Republic and the Separatist Alliance, was one of those battles. Another was a later engagement that took place on a rainy terrestrial object.
The Hawkbat Battalion, a sub-unit of the 3rd Brigade, made its debut in "Chapter 1" of the Star Wars: Clone Wars micro-animated television series, which was launched on November 7, 2003. The 2019 bust for a Hawkbat Battalion character by Gentle Giant Studios revealed the parent organization.