Dr. Watson and the war in Afghanistan, past and present.

In the original adventures of Sherlock Holmes, written by A. C. Doyle, Dr. Watson served in the second Afghan War.
"The regiment was stationed in India at the time, and before I could join it, the second Afghan war had broken out...I...succeeded in reaching Candahar in safety, where I found my regiment, and at once entered upon my new duties." -A Study in Scarlet.  Candahar is another spelling of current Kandahar, a city in Afghanistan.

In the new BBC Sherlock series, Dr. Watson also served in Afghanistan.

So, they're just keeping it true to the book, right?

The amazing thing though is that Sherlock is set in our current times, and there currently is a war with British soldiers participating in it in Afghanistan, if this series had been produced 15 years earlier or later than it was, this statement would have been non-nonsensical. They would have had to substitute the name of a different country or set the show in the past. But they didn't, because there was a war there then, and there is a war there now.

A Passion for Rings

In The Saga of King Hrolf Kraki there is a ring that is coveted greatly. The passion for this ring and the terms in which it is spoken of is similar to The One Ring from The Lord of the Rings, by J. R. R. Tolkien.

The story of this ring begins thus: "A ring owned by King Helgi was a widely famed treasure. Both brothers wanted it, and so too did their sister Signy."

King Hroar offered to give his brother, King Helgi, his share of the kingdom in exchange for the ring, saying, "I want the ring, the one that is the best treasure in your possession and that both of us would like to own." Basically, Hroar saw this ring as worth half a kingdom.

Helgi agreed to this deal, "after such a speech, nothing else is fitting but that you should have the ring."

However, that is not the end of the episode. Hrok, with the encouragement of his mother Signy, also decided he wanted the ring. He demanded that King Helgi (his uncle) give him a third of the kingdom or "the great ring." Helgi informed him that Hroar had the ring and that his claims were arrogant.

Isildur and The One Ring

Hrok then went to Hroar, and asked for the ring. Hroar replied, "I have given so much to get this ring that I will by no means part with it."

Hrok then asked to see it, saying he wanted to know if it was really "as much a treasure as it is claimed." Hroar readily showed it too him and Hrok threw it into the sea after saying, "I have never seen a comparable treasure, and the reason you esteem the ring so highly is obvious. The best solution, it seems to me, is that neither of us, or, for that matter, anyone else should enjoy it." He had no right to such an action. His claim on the ring was small enough, and Hroar had traded half the kingdom for it. Hroar chopped of Hrok's foot in response. After healing, Hrok assembled an army with which he defeated and killed Hroar. Helgi then defeated Hrok and instead of slaying him, broke all his limbs so that he was a cripple the rest of his life. And this was all between family! Many people searched the waters for the ring and Hroar's son, Agnar, finally found it after diving for it.

So, that's a summary of the ring episode. Although this ring was not imbued with the magical and evil properties that The One Ring possessed, it was coveted in much the same way, resulting in wars and the loss of limbs (Frodo lost his finger, Hrok, his foot). Hrok referred to it as "the great ring," giving it a title, much like, "The One Ring."  In The Lord of the Rings, it was suggested the the ring be thrown into the sea, but that idea was rejected because it could be found again eventually.

However, Hroar's ring could have been an arm ring and not a finger ring like The One Ring.
 
The Saga of Hrolf Kraki. Translated by Jesse L. Bylock. Published by Penguin Books, 1998.