Both Uses

although
in
Childhood's End
(Auto-generated)

I have to go down there and convince my fellow men that although you won't show yourself, you've got nothing to hide.†
Chpt 2 *

although = even though -- used to connect contrasting ideas
It was a considerable compliment to Rupert that although thirty guests had been invited, over forty turned up-which was about the percentage he had expected.†
Chpt 7

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)