(This part is pretty hand-wavy, and only exists to provide context for a fun thought-experiment/fictional story. Feel free to skip to next paragraph) In 1943, the Soviet Union has developed what they believe to be a teleportation device. They can only fit one rifle squad within this device, so they hand-pick an elite squad of volunteers, equip them with loads of ammunition, and test it by attempting to send the volunteers from Moscow to the front. Unbeknownst to them, they had accidentally created a time travel device, that sent the soldiers back in time to 1066 England, the beginning of the reign of William the Conqueror. The device is destroyed in this first use, but the Russians are delivered safely to Medieval England. Being good strong Russian soldiers, they waste little time bemoaning their situation (once they realize what has happened, which will likely take some time to piece together. Like a lot of time) and quickly decide that if life gives you lemons, you might as well set yourselves up as the new rulers of England right? This is a time of political upheaval in England to begin with, and there were already some uprisings against the new king as it was.
The question, then, is as follows. Can a single Russian rifle squad use their massive advantage in military technology to outweigh their equally massive disadvantage in numbers, and set themselves up as rulers? All of their weaponry is in good working order, and they are the cream of the crop of the 1943 Russian military. They have extra ammunition, basically as much as they could carry, but have no hope of ever resupplying. They will likely be seen as gods or wizards by many, because of their firepower. Also, it should be possible for them to recruit help, at least at some level, given William's relative unpopularity.
The Soviet Rifle Squad is made up of eleven men, armed according to the attached graphic. Clearly they have an incredible advantage in any direct fighting with even numbers, and great mobility as compared to any army large enough to fight them. However, they must seek to avoid large scale conflicts that would take all of their ammo to win, because a rifle without bullets is an expensive club. I am looking for political and military strategies they can use to successfully topple William, and set themselves up as rulers.
Note: for the purposes of this question, please ignore some of the more obvious problems here, such as language differences, and the issue of diseases being brought back by the Russians and wiping out the continent. Valid concerns, but for this thought experiment I am primarily focused on what military/political strategies the Russians could use, as well as what the best course would be for William to retain his throne. If I have made assumptions or incorrect statements regarding either the Russian element or Medieval element, or if there is extra info that would be helpful, please use the comments and I will edit as soon as I can. This idea of a small modern force seeking to conquer a medieval country has been kicking around in my head for a while now, and I am very curious to hear from some people with more expertise/knowledge than I.
Edit: Some "Answers" so far have surrounded the fact that there is a massive numerical disadvantage. This is obvious. If there is in fact no way to overcome this, that's a valid opinion, but what would be the best way to try? I'm fine with them getting a little way and ending in failure, this is actually probably better so as not to disrupt the historical timeline, but what strategy might they attempt?