Prior to the Skirmish at Vanqor, Jedi KnightAnakin Skywalker allowed himself to be captured by a Munificent-class star frigate, commanded by Count Dooku in an ice field near Vanqor. Once inside the ship's hangar, he put up a fight in order to make his capture look convincing. He was defeated and taken to the brig.
Jedi MasterObi-Wan Kenobi later infiltrated the ship to release Anakin in order to help apprehend the Count. When the two arrived at Dooku's quarters, they confronted the Count but he managed to escape through a hatch to the warship's hangar, where he promptly boarded a Punworcca 116-class interstellar sloop. He then departed the warship and was escorted by a squadron of Vulture droids, including this one.
Obi-Wan then raced aboard a Sheathipede-class transport shuttle, and was quickly joined by Anakin. The ungainly transport pulled away from the frigate, and started chasing down the fleeing Sith Lord with Anakin taking over the controls while Obi-Wan manned the shuttle's cannons. A blast from the cannons winged Dooku's sailer, and its flight path began to curve toward the nearby planet of Vanqor.
The Vulture droid escorts then turned around to harry the shuttle. This droid engaged the Jedi shuttle directly, and Kenobi was unable to shoot it down. The droid starfighter then collided with the shuttle, destroying itself and crippling the ship which started diving towards Vanqor as well.