There is a good list of bis phrases here, but it doesn't include 'bis an'.
Eine noble Kriegerin bis an ihr Ende,...
"A noble warrior until her end...". Is the 'an' needed here? Can the phrase be written without it?
"Bis" usually only works with time.
It does work on it's own in a locational or abstract sense too... but not very often.
Usually you will have to use an extra preposition. That can be "zu", "an", "in", etc
That wouldn't work without "zu"... I would be asking "Bis die Kreuzung WAS?". In fact, I have difficulty to "feel" the case that goes with "bis". "Bis den", "bis dem"... both sound awkward to me. That is not to say that there isn't a case... only that it is almost never used in combination with an article.
Since the answer seemed to not have been clear enough... no I'd say just assume that you can never leave out the preposition after "bis" if there is one.
in this case „an ihr Ende“ is a time range (until her death). This sentence can't stand without the „an“, it would be plain wrong. If you have to rewrite the sentence, you could write „bis zum Ende ihrer Tage“, here again the „zum“ is needed.
Bis wird benötigt eine weitere Präposition, auch wenn es manchmal ohne verwandt wird (bis ein Uhr statt bis um ein Uhr).
ist falsch. Neben
No, it can not be written without a preposition (here
A case when