Why do you think general george

b. mcclellan did not finish off general robert

e. lee's troops when he had the chance?

This is because he was overly cautious. He didn't want to launch a full attack because he believed that they might have a counter attack prepared which would bring his army harm. In reality, he didn't know that the Confederate army was too weak and wouldn't be able to do anything and would have easily lost the battle.