[Gideon7]

The original Study in Scarlet had Watson returning from the Afghan Campaign (the 1800s one) with a bullet in his shoulder.

[SAJ]

Abd yet, just one novella later (The Sign of Four), Watson's bullet wound had magically moved to his leg (cf. "...and a six-mile trek for a half-pay officer with a damaged tendo Achilles."

[Oztrich Boy]

The original Study in Scarlet had Watson returning from the Afghan Campaign (the 1800s one) with a bullet in his shoulder.

Or was it his leg? Conan Doyle never could decide