How did general lee’s smaller army defeat mcclellan’s force and keep union troops out of richmond

The way that General Lee’s smaller army manage to defeat McClellan’s force and keep Union troops out of Richmond is: b) Lee took advantage of McClellan's cautious style 
Knowing McCellan's style, General lee keep ordering unrelenting assaults to the  McClellan's forces, making him became distracted and losing a lot of his men at the same time.

Not sure if it’s within 12 months, but you could talk about the spreading of alt-right hate speech and whether that is covered by the right of freedom of speech? or, cover how during the midterm elections in some states many native american populations were declined to vote because they didn’t have the proper id, despite being citizens? also, the death of that journalist last month, who spoke freely and reported about the saudi government and how corrupted it is and was killed because of that (lack of free press/speech). just some ideas for this prompt, i hope at least one of them : )