Leif
Adventurer
*AHEM!* Forrivara hastens to point out that if we enter while the vast majority of the giants are SLEEPING it will have much the same effect as silence and invisibility spells, at least until the first pitched battle occurs, which would spoil invisibility and silence anyway, and that way we could save the spells and use them after the first battle, so we could effectively DOUBLE the effectiveness of our sneaking.