A/N: I know this may not fit 100% into the Star Wars: The Clone Wars section of the site, but my reasoning for putting it here will make sense later.
An Imperial star destroyer was in orbit over the planet Kashoon, the next one to be conquered as part of Palpatine's plan to rule the galaxy. A squad of stormtroopers were boarding a Sentinel-Class landing craft to descend to the planet. The inhabitants of the planet, the Kashoonara, were considered to be a savage, primitive, race, causing the Imperial officers to believe minimal resources would be necessary to conquer the world.
The landing craft made it's way down to the planet's surface, where the troops deboarded and immediately began checking their surroundings.
"All clear. Let's move in," one trooper commanded.
Blaster fire filled the air as the troopers encountered a nearby village, killing a number of the natives. Rather quickly, men armed with various weapons began a highly-organized counterattack and managed to take down several of the invaders before making a temporary retreat due to still being out-gunned.
"Let's follow them, men!" came the command from the sergeant.
A corporal added, "At this rate, we'll have this world conquered before nightfall!"
About a dozen stormtroopers charged at the group of Kashoonara, who were now outside the village, leading near some trees, seemingly goading them. However, once the troops had pursued the natives into the forest nearby, there was a green flash, after which most of the troops were struck down, apparently by a lightsaber. The Kashoonara had a Jedi helping them! Reinforcements tried to come to their aid, but failed due to being unable to see their opponent, who managed to slaughter most of the squad.
The few remaining troops raced back to their shuttle and returned to the star destroyer that was in orbit over the planet to report what had happened and to get reinforcements. Once they were face-to-face with Vader himself, the last remaining sergeant began speaking.
"Lord Vader, we had a group of Kashoonara on the run, when most of the men on our squad were killed by a Jedi."
Vader considered this for a moment and replied, "Are you certain this was a Jedi, Sergeant?"
"Yes, Lord Vader. Whoever it was killed the men with a lightsaber," the commander answered.
"There are some non-force users who are skilled with a lightsaber," Vader commented nonchalantly.
"Sir, I fought with a number of Jedi during the Clone Wars. Only one of them could be that quick and effective."
Vader nodded in acknowledgment. "I will deal with this matter personally."
Turning to leave the room, he added, "First, I require time in my meditation chamber. I sense…a familiar presence in the force. See that I'm not disturbed."
"Yes, Lord Vader," the stormtrooper commander acknowledged quickly.
Vader retired to his meditation chamber and, after confirming what he sensed, climbed into his shuttle to fly down to the planet. He knew that if there was indeed a Jedi there, they would likely sense his approach and come looking for him, providing ample time to prepare.
The shuttle descended to the planet, setting down in a large clearing near the original one the stormtroopers were in earlier. Then, Vader exited the shuttle and dropped to his knees to meditate while waiting for his enemy, the mysterious Jedi, who by now had likely sensed his arrival.