"Size matters not. Look at me. Judge me by my size, do you? Hmm? Hmm. And well you should not. For my ally is the Force, and a powerful ally it is."
―Yoda

Something about Yoda

Yoda was one of the most renowned and powerful Jedi Masters in galactic history, who was known for his legendary wisdom, mastery of the Force and skills in lightsaber combat. Yoda served as a member of the Jedi High Council in the last centuries of the Galactic Republic and reigned as Grand Master of the Jedi Order before, during and after the devastating Clone Wars. Following the Battle of Geonosis Yoda held the title of Master of the Order in addition to that of Grand Master. In his centuries of service to the galaxy and the Force, Grand Master Yoda had a hand in the training of near to all the Jedi in the Order, including such luminaries as Obi-Wan Kenobi, Ki-Adi-Mundi and Oppo Rancisis; all of which would come to serve on the Jedi Council along with him.
Though Yoda was, arguably, the most highly Force-attuned member of the Order, he was not flawless. It was partially due to his failure to recognize that Supreme Chancellor Palpatine was actually responsible for the outbreak of the Clone Wars, and was in fact the Sith Lord Darth Sidious, that the Republic was overthrown and the Jedi Order decimated. The Grand Master was among the few Jedi to survive Emperor Palpatine's Great Jedi Purge, after the beginning of which, he went into exile on the swamp planet of Dagobah.
Later, before becoming one with the Force in 4 ABY, the exiled Jedi Master was responsible for the instruction of Luke Skywalker who would use Yoda's training as a basis for the creation of a New Jedi Order, after defeating the Sith. Following his death, Master Yoda retained his identity within the Force and was revered as among the most legendary Jedi Master's of all time by Skywalker's reconstituted Order.

Whats Grievous's problem, anyway?

Grievous, born as Qymaen jai Sheelal, was the cyborg Supreme Commander of the Droid Army of the Confederacy of Independent Systems for most of the Clone Wars. Grievous was originally a Kaleesh from the planet Kalee, where he lived his early life. The Kaleesh were at war with the Huk in a conflict known as the Huk War. Qymaen jai Sheelal quickly learned the art of war, specializing in a slugthrower rifle. Quickly amassing a great number of Huk kills, he became a demigod among his people. He would then meet the female Kaleesh Ronderu lij Kummar, a master with the sword. The two became very close before her death at the hands of the Huk. Heartbroken, Qymaen jai Sheelal renamed himself Grievous, and then turned all his anger and grief toward the Huk. Aided by his elite, he forced the Huk off Kalee and then swarmed their world, conquering the Huk homeworld. The Huk turned to the Republic for help, and the Kaleesh were forced back to their own world by the Jedi, and left to starve.
Desperate to help his people, Grievous took a job as an enforcer with the InterGalactic Banking Clan. However, after learning that the Huk had attacked Kalee, he headed home to gain vengeance. IBC Chairman San Hill, after consulting with his ally Count Dooku, leader of the Confederacy of Independent Systems, arranged for a bomb to be placed on Grievous' shuttle, Martyr. The Kaleesh was critically damaged, but lived, and then, Hill arranged for the final stage of his plan. Grievous was reconstructed as a cyborg, and was presented to Dooku as a potential weapon to be used in the upcoming war the Count planned.
Grievous was made Supreme Commander, and then, proceeded to wreak havoc on the Republic for three years in the Clone Wars. The general was trained in the art of lightsaber combat by Dooku, who was also a Sith. Grievous was a quick study, and would soon be recognized as one of the most skilled duelists in the galaxy. Aided by his IG-100 MagnaGuards, Grievous killed many Jedi. He led the Confederacy of Independent Systems in the Battle of Hypori, where his existence was made public. In the many battles, such as the Battle of Falleen, Mission to Vassek, and the Battle of Togoria, the Confederacy was victorious thanks to Grievous's leadership. The fearsome cyborg struck fear into the hearts of many with Operation Durge's Lance, a massive strike at the Core.
In 19 BBY, Grievous led the Confederate Navy in the Battle of Coruscant, an attack on the Republic's capital. Grievous killed several Jedi, and took Chancellor Palpatine, leader of the Republic, hostage. However, before his flagship could jump to hyperspace, the Republic Navy arrived. The Chancellor was freed by the Jedi Anakin Skywalker and Obi-Wan Kenobi, who also succeeded in killing Dooku. Grievous fled to the Outer Rim world of Utapau, and attempted to regain control of the war, though the Confederacy had been dealt a great blow with the loss of Dooku. Grievous was killed shortly after arriving in the Battle of Utapau by Obi-Wan Kenobi, and the Confederacy would follow soon after. At some point after Grievous's death, his body was used to create the droid warrior N-K Necrosis, who considered himself the reincarnation of Grievous. However, the droid was killed shortly after his creation by several spacers.

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Yoda Is The Best.