From Wookieepedia, the Star Wars wiki.
The Skirmish at Eos occurred when the Trade Federation attempted to terminate Vana Sage after she discovered incriminating evidence against the Federation.
While performing tests on Scarab-class droid starfighters, Vana Sage’s droid, Mod-3 detected a coded message. Decoding it, Vana listened to a mercenary describe a recently failed attempt to kidnap Queen Amidala, until she was jammed by her Trade Federation supervisor. The Federation employee then sent numerous Hunter-Seeker droids after Sage and left the system. After managing to destroy all the droids, a wing of mercenary starfighters emerged from hyperspace. The mercenaries attacked Sage, but she managed to defeat all of them. After the fighting, Mod-3 scanned the wrecked and found one lone, damaged Hunter-Seeker droid heading toward Eos. Thinking the planet was uninhabited, Vana decided to follow the droid.
[edit] Planet surface
Vana followed the droid to a large mining facility. Moments after Sage arrived at the complex, a shield was activated over area, trapping her inside. Staying calm, Sage determined that destroying seven of the eight shield generators would bring down the shield. Evading more Hunter-Seeker droids and other defensive weapons, Vana was able to destroy the generators and flee the planet.
[edit] Aftermath
Vana Sage would later return to Eos with Nym and Rhys Dallows to destroy the droid factory and prevent an invasion of Naboo. During the battle, the Trade Federation did not use a defensive shield to protect their facilities.
[edit] Appearances