Plz tell the meaning of this line: - From a flock of forty which he drove into a pen at night.

Plz tell the meaning of this line: - From a flock of forty which he dr

1.	Plz tell the meaning of this line: - From a flock of forty which he drove into a pen at night.
Answer» If the farmhand is on a big farm or ranch he might SPEND, say, a WHOLE day rounding up sheep over a large area and driving them "to the pen" - i.e. he TAKES them from a POINT some way away to the place where the pen is.