What are two big mistakes mcclellan made that cost him a victory over lee at antietam? -he was surprise-attacked by lee. -he thought lee's army was much smaller than it was. -he failed to use one-third of his army. -he kept his headquarters too far from the battlefield.

The answers are C and D. Hope this helped. But it's probably too late given the question's age.

he sent troops to protect the students as they entered the school.

the option which was not a function of missionaries in the northwest was the first one - they established posts for trading furs and other goods.

missionaries were sent around the world to spread religion and their knowledge and others - they were not merchants who sold furs and other goods.