Because he was not an active member of the Jedi Order during Order 66, Infil'a escaped execution. Some time later, he faced the Sith Lord Darth Vader wielding a green lightsaber. Infil'a put up a fierce fight against Vader, almost killing him by throwing the Sith Lord off of a cliff.
While their stories are similar, Darth Revan went even further than Vader. Whereas Vader bowed to Darth Sidious, Darth Revan was so powerful that he bowed to no one, becoming the sole leader of the Sith. He was able to do what Vader did but even greater.
Darth Sidious
In the end, Vader managed to fulfill the prophecy tied to him. As for Darth Sidious, he's by far the most dangerous enemy Vader has had. Becoming emperor of the galaxy and crushing most of the Jedi was proof enough.
This information comes to light form the comic series Darth Vader: Dark Lord of the Sith by Charles Soule and Giuseppe Camuncoli, in particular issue #7. Palpatine admits to Darth Vader that the Jedi he actually feared most was none other than Jocasta Nu.
Vader held respect for Tarkin which is clearly shown and the only case in which Tarkin outranked Vader would be the case in which Vader was in the Death Star or within Tarkin's Oversector which he likely was as Tarkin was Grand Moff of the Outer Rim Oversector, the largest one.
Admiral Ozzel : [appearing onscreen with Captain Piett] Lord Vader, the fleet has moved out of lightspeed and we're preparing to... Darth Vader : You have failed me for the last time, Admiral! Captain Piett?
Return of the Jedi (1983). In the original trilogy, Palpatine is depicted as the Emperor of the Galactic Empire and the master of Darth Vader.
His armor could be hacked and controlled by a device. In a turn of events, Darth Vader's right limb holding his dangerous scarlet lightsaber was moving of its own accord toward his neck. This was a dangerous weakness indeed.
In a Vanity Fair interview from 2005, George Lucas went deeper into why Anakin became much weaker as Vader. In the interview, he explained that because Anakin's limbs were severed and replaced by robotics, it was harder for him to use the Force than it was before his battle with Obi-Wan.
Only one person could defeat Darth Vader once and for all. The spirit of Anakin Skywalker, long dormant, finally rose and overcame the dark side. While his body failed him, Anakin rose once again and defeated the Sith once and for all.
Vader Force chokes Motti for his lack of faith. By 0 BBY, Motti served as Admiral of the Navy, and held the position of Chief of the Imperial Navy.
Did Darth Vader ever lost a fight? Darth Vader is one of the greatest villains of all time. But even he gets beaten sometimes. CBR lists all of the folks who managed this improbable feat!
The duel. Darth Vader defeats Darth Maul. The two Sith Lords engaged in a lightsaber duel, going through the volcano and onto a bridge situated over a river of lava, which collapsed, though they both survived and continued their battle.
Rey just couldn't match up to Vader. Her power may be greater but she doesn't have the training, in the Force or with a lightsaber, to be able to stand up to Vader. She'd try but it's doubtful she'd last long against the Force and lightsaber onslaught of Darth Vader.
When he was Anakin, he feared losing the people closest to him, whether it was by distance or death. He did end up losing pretty much everyone close to him, namely Qui-Gon, his mother Shmi, then lastly Padme. It was his fear of never ending loss that drove him to become Vader.
His suit followed an ancient Sith tradition, in which the warriors of the dark side of the Force would adorn themselves in heavy armor.
Eventually, he lost both his legs and his remaining arm in the climactic duel on Mustafar between both he and Obi-Wan. As Vader, he had each limb replaced with cybernetic parts, but would lose his robotic right arm one last time when Luke Skywalker faced his father in Return of the Jedi.
The ever stronger fear
In the Phantom Menace, Master Yoda senses much fear in Anakin, however, this fear is not the understandable anxiety - Anakin is afraid to lose his mother, Shmi, whom he was forced to leave behind in slavery.
Although his choice to help with the droid attack on the Wookiees seemed to be a prudent one in Star Wars: Episode III - Revenge of the Sith, Yoda's Kashyyyk mission was actually his worst mistake.
Fighting Emperor Palpatine
Though Yoda was able to keep his adversary on his toes, he was unable to end the conflict, and their duel ended with no clear victor.
There are several parallel hand removal scenes in the Star Wars saga, but Luke cutting off Darth Vader's hand in "Return of the Jedi" is the most obvious.
However, Sidious' plan backfired when Vader ultimately renounced the dark side and killed Sidious to protect Luke. Thus, with the Sith's destruction, the Force was brought back into balance, fulfilling Anakin's destiny as the prophesied Chosen One.
Legend had it that Yoda—a Jedi who became Grand Master—was trained by N'Kata Del Gormo. A Force-sensitive Hysalrian, N'Kata Del Gormo was trained in the ways of the Force and achieved the rank of Master within the Jedi Order.