To spied on McClellan's army to find out the size and then attacked. And encourage England to intervene on their side.
I hope that's help !
and the map is to the question there are 2 pictures :)
Weathering occurs in warm and cold climates.
B.
Weathering and deposition occur at the same rate.
C.
Man-made structures can be created from rock.
D.
Similar events and features occur in old and new rock layers.