[Consort]

... U-14 and U-13, were not commissioned until April 24th and 25th, 1913 (respectively).

I think you meant 1912 instead of 1913, but, yes, that would be after the sinking. Maybe the subs were refuled at sea, as you mentioned, if that was done in those days.

[capitan_refugio]

You are correct, "1913" was a typo on my part. I meant 1912.

[capitan_refugio]

About the only factual statement concerning pre-WWI U-boats was that they did deploy to the North Atlantic in 1912. The only problem is, there is no record they deployed to the north-WEST Atlantic. The North Sea is, afterall, part of the north Atlantic; as is the English Channel; as is the Norwegian Sea; as is the Faroes Gap; et cetera. The German U-boats of the era, as were almost all submarines built then, basically for coastal defense. This would change in a few short years. But in 1912, the idea of an ocean-going submarine was only found in Jules Verne novels.