Both Uses

although
in
Moby Dick
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So that overawed by the rumors and portents concerning him, not a few of the fishermen recalled, in reference to Moby Dick, the earlier days of the Sperm Whale fishery, when it was oftentimes hard to induce long practised Right whalemen to embark in the perils of this new and daring warfare; such men protesting that although other leviathans might be hopefully pursued, yet to chase and point lance at such an apparition as the Sperm Whale was not for mortal man.†
Chpt 40-42 *

although = even though -- used to connect contrasting ideas
Ahab well knew that although his friends at home would think little of his entering a boat in certain comparatively harmless vicissitudes of the chase, for the sake of being near the scene of action and giving his orders in person, yet for Captain Ahab to have a boat actually apportioned to him as a regular headsman in the hunt—above all for Captain Ahab to be supplied with five extra men, as that same boat's crew, he well knew that such generous conceits never entered the heads of the owners of the Pequod.†
Chpt 49-51

Definitions:

(1) (although)
even though -- used to introduce an idea that contrasts with or makes the main statement surprising

At the start of a sentence, although can play a role similar to words like however, yet, still, even so, on the other hand, or nonetheless—all of which signal contrast. In the middle of a sentence, although can sometimes be used where but or though might also work, but though or but often sound more natural. For example, "She's a great teacher, though not the most popular" is usually smoother than "She's a great teacher, although not the most popular."
(2) (meaning too rare to warrant focus)