"A Stranger in Town" is a short story penned by the Fillbach Brothers, and it can be found in Star Wars: Clone Wars Adventures Volume 3.
Yoda, a Jedi Master, arrives in a town on a mysterious planet, carrying a very large package. He disregards the mocking and insults from the gathered people, and the green Jedi enters a bar, where he orders a beverage and has a conversation with a local who is more amicable. News arrives that a Separatist force has landed, and Yoda silently leaves his seat to reveal what was hidden: the box held a massive chaingun.
He rapidly employs it against the assembled B2 super battle droids, B1-Series battle droids, DSD1 dwarf spider droids, and unidentified tracked tanks, and Yoda is able to defeat the entire army, with the exception of the stocky commander. Yoda then activates his lightsaber and begins cutting through the commander's armor, causing the commander to flee. Yoda then repacks his belongings and departs, leaving the townspeople in stunned silence.