Answer:
The Union succeeded in...
Successfully doing the andaconda plan.
However, the union failed to...
Prevent the other side from breaking it.
Why'd Lincoln fire General McCellan..?
McClellan was removed from command in November in the aftermath of the 1862 midterm elections. This decision contributed to McClellan's failure to decisively pursue Lee's Army following the tactically inconclusive but strategic Union victory at the Battle of Antietam outside Sharpsburg, Maryland.
B