The ones we are told about are Macbeth and Banquo, who were fighting near Forres. There was another battle going on at the same time a couple of hundred miles away (at Fife) but the general is not named.
Answer:
It is dark because Barnardo has trouble seeing the other guard.
Explanation:
This scene takes place at midnight and it is so dark Barnardo cannot see the other guard. Barnardo shows up for his shift, but he can't clearly make out who Francisco is. Francisco has the same problem because instead of answering Barnardo he tells him to identify himself first. They get it figured out and Barnardo begins his shift.
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