The Lancer Battalions comprised lancer troopers within the structure of the Grand Army of the Republic. These Lancer Battalions saw sporadic deployment against the Separatist's IG lancer combat droids and cumbersome formations of battle droids. Their involvement in the Battle of Muunilinst, occurring four months after the commencement of the Clone Wars, is particularly noteworthy.
Equipped with Aratech 105-K lancer bikes, these specialized speeder-mounted clone troopers directly confronted the enemy, impaling lancer droids utilizing their Verpine power-lances. Typically, the Lancer Battalions were utilized to divert enemy attention away from advancing turbolaser batteries, which served to demolish heavily defended objectives. It is believed they followed a typical battalion structure consisting of 576 clone troopers and officers.