1 Nephi 4:5

5  And it was by night; and I caused that they should hide themselves without the walls.  And after they had hid themselves, I, Nephi, crept into the city and went forth towards the house of Laban.

             Then this fifth verse is interesting too. In an old Saints Herald where Emma Smith was

being   interviewed after the death of the Prophet, she said when they got to this passage

(Joseph Smith was translating with the seer stones), he looked up with surprise and said,

"Emma, did Jerusalem have walls?" He didn't even know the city had walls. He didn't

know anything  about what he was writing here. Yes, Jerusalem had walls.

-Hugh Nibley, Teachings of the Book of Mormon, Semester 1, p.159

            It was very late at night, and this was not the strictly legitimate way of going about

things; but Nephi had been encouraged by an angel, and he was resolved to get the plates

by fair means or foul. He had reached the end of his resources, and his situation was

completely desperate.

-Collected Works of Hugh Nibley, Vol.6, Part.4, Ch.9, p.112 - p.113