Answer:
Correct answer is B. Battle of Chickamauga.
Step-by-step explanation:
B is correct answer, because it was a famous battle led in September of 1863 in which around 34 000 soldiers died. One of the bloodiest battles in the whole war.
A is not correct as Antietam is located in Maryland.
C is not correct, as this battle was a result of great siege that eventually led to just a couple of casualties.