How does Euron travel so fast?

Question

WARNING: Here be spoilers! (for Game of Thrones Season 7 Episodes 2 and 3)

We all know Euron Greyjoy is a little crazy. Those who have read the book know he is also more than a little dangerous (which is starting to come out on the show also).

In Season 7 episode 2

We see Euron's Iron fleet wreck Yara and Theon's Iron fleet. I assume this happened between Dragonstone and King's landing, but could be mistaken.

After that, in episode 3 we see

Euron takes the prisoners he caputured to King's Landing. He then sails all the way around the other side of Westeros to Casterly Rock where he destroys the fleet the Unsullied used to get there.

How did he manage to get from one side of Westeros to the other so quickly, assuming as it is portrayed on the show that

both of the fleets under Dany's command left at the same or similar times.

It seems that he should be days behind. A few explanations could be: 1. The show is misleading for the sake of time. 2. His ships are much faster (perhaps due to design/favourable winds/enhancement). 3. He has a magical method of travelling faster than normal.

Is there any evidence (in either the show or books) for any of these? Perhaps there is not yet enough information to give a concrete answer, but if there are any hints given they would be good to know. Both book and show answers are fine, they may even be different.

I have added a map for a better understanding of the distances between the places mentioned in the question, all the places are in the lower third, two on the east side of Westeros and the other on the west.

Answer 1

There's a few gaps in your assumptions that can give Euron a window to do what he does.

Note that I'm forgoing spoiler tags as this entire answer is one big spoiler.

We see Euron's Iron fleet wreck Yara and Theon's Iron fleet. I assume this happened between Dragonstone and King's landing, but could be mistaken.

Looking at the map you posted, there's no reason for Yara to sail towards King's Landing (Blackwater Bay in general).
Although this is an assumption on my part, the fact that the Sand Snakes were cozy in their hammocks and Yara was having a drink with Ellaria, it stands to reason that they had been travelling some time. So I doubt that the ambush took place near Blackwater Bay.

However, looking at the route from Dragonstone to Sunspear (their intended destination), it seems there are a few locations that are hard to avoid. Keep in mind that it's significantly easier to sail by staying close to shore (visual aid), rather than having to rely on compasses or astronomy.

Euron could have been waiting for them at one of the unavoidable points, e.g. the entrance to the sea of Dorne, or the eastern cape just south of the sea of Dorne. Any route that avoid these points will be incredibly convoluted, and it seems clear that Yara wasn't expecting hostile interaction on the way (so it makes no sense for her to take such a convoluted route then)

How did he manage to get from one side of Westeros to the other so quickly, assuming as it is portrayed on the show that both of the fleets under Dany's command left at the same or similar times.

It would be more accurate to say that Grey Worm and Yara's fleets started preparing for their journey at the same time.
Looking at the map once again, if Yara and Grey Worm left at the same time, they must have been travelling together, since Sunspear is on the way to Casterly Rock.

Yara's mission was to fetch Dornish soldiers. Logically, she must have left with relatively empty ships, so that the Dornish can be added (without needing to leave others behind, which would defeat the purpose). That requires little preparation time.

Grey Worm's mission was to send soldiers. This means that a lot more preparation time is needed. Provisioning the boats, loading the men, ...

It also seems fair to consider that the Greyjoys are the most adept sailors compared to everyone else, so it's very likely that they can mobilize faster than others. This can apply to both Yara and Euron.

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New conclusions

Let me rewrite your interpretation according to the differences I've addressed.

• Yara leaves before Grey Worm, due to less preparation time and having worthy sailors as a crew.
• Euron waits for Yara at given location and ambushes her.
• Euron sends his fleet to Casterly Rock (he himself took a trip to King's Landing if you remember)

There are two options here:

• Euron's fleet could have left for Casterly Rock before Grey Worm. This makes it likely that they were again waiting to ambush Grey Worm, and were even there before him.
• Maybe Grey Worm had already progressed further when Euron's fleet departed for the Rock, but since Euron ambushed Yara somewhere between Dragonstone and Sunspear (which is en route to Casterly Rock), then Euron's fleet had less distance to travel than Grey Worm did. If you combine the Greyjoy sailing aptitude, shorter travel distance, and Grey Worm's time needed to take Casterly Rock after their sailing trip; then this should give Euron's fleet more than enough time to catch up.

Regardless of the options, I think the relatively unmentioned but important preparation time for Grey Worm's fleet to depart gave Euron enough time to attack both fleets.

Answer 2

I thought of the same thing today and here is what I came up with:

Euron talks with Cersei in Kings Landing. Then he sails to the location between Dragonstone and Sunspear where he ambushes the Sand Snakes in episode 2. Kings Landing is between Dragonstone and Sunspear, so with his fast ships he can easily ambush them.

In episode 3 he brings his fleet to Kings Landing, which is also possible. It's just a return trip. Now the important part begins:

In episode 3 Tyrion says that Euron might have fleets in multiple locations, when Daenerys suggests trying to fight them with dragons. That is the foreshadowing. After that the attack begins in Casterly Rock. We also see again from the map that Pyke is relatively close to Casterly Rock, so the Ironborn can make a second fleet and send it to Casterly Rock before the Unsullied arrive.

I accept that the last ship at the end of the battle looks like "Silence" but we don't see Euron Greyjoy anywhere in the scene. He is the rockstar of the show for now, so if he was there we would probably see him. He is sort of like a deux ex machina for House Lannister in this season.

Answer 3

The simplest and most obvious answer is that it just does not make sense and you've come to that conclusion - it's simply a plot hole.

The geography in the show at this point does not make sense at all and some things just happen out of convenience, they have not thought of everything. After all, if showing dragons, magic and undead on screen is believable then surely the people will believe that the characters could've traveled from point A to point B in the needed amount of time.

I like your proposed explanation, as well as atayenel's, and I'd like to add that Euron might of sent his fleet to Casterly Rock while heading to Kings Landing so he isn't actually there and all these theories would make sense, however they were never implied in the show, which is why for now I would dismiss them. They can't be ruled out for future episodes but it seems unlikely that they will come back to this.

In terms of books, Euron is nowhere near this stage as far as I know (I have not read the books). Euron has yet to travel to Kings Landing even once or form a fleet in the books.