Culhwch
Lost Boy
Jon Snow and the Night's Watch face a big challenge.
Also one thing that puzzles me - why set fire to arrows?
Same reason modern day soldiers use tracer rounds. When fighting at range in the dark it helps to see how close you are to the target. This would be especially necessary for the archers atop the 700ft wall, their arrows would be impossible to see at that range.
Maybe so many didn't like this episode because of the change of format. In the past episodes have skipped back and forth between different locations but this was almost exclusively set on the Wall. Everything that happened was on the Wall. Even if you are a fan of big epic battles, the episode had a different feel to it. I hope they return to the old format of jumping about and contrasting the different settings as I think that works best.
I think the episode about attack on King's Landing just concerned that one event also? I do prefer the multi-view format, but (for me) this didn't disappoint for that reason, it's just that with all the build up we've had to this climatic event , it went off as a sub-standard LOTR.