Explain as well

fought between september 18-20, 1863
battle was in northwest georgia, just south of chattanooga
second-highest number of casualties in the war
decisive victory for the confederate troops
union forces withdraw to chattanooga

which would make the best title for this list of notes about the civil war?

a)
the battle of antietam

b)
the battle of nashville

c)
the battle of gettysburg

d)
the battle of chickamauga