Arrange the following in chronological order:

(A) the Battle of Bull Run,

(B) the Battle of Gettysburg,

(C) Lee's surrender at Appomattox,

(D) the Battle of Antietam.

A, D, B, and C.

Explanation:

The Battle of Bull Run or the Battle of Manassas started on 21st July 1861 between the Union and Confederate. The Battle took place near Manassas junction. Union was led by General Irvin McDowell and Confederate was led by General Pierre G. T. Beauregard. This was the first of the major battle of the American Civil War. The battle was won by Confederate.

The Battle of Antietam or the Battle of Sharpsburg took place at Antietam which is situated near Sharpsburg, Maryland. The battle began on 17th September 1862. The battle was won by Unions.

The Battle of Gettysburg was considered to be the bloodiest battle of American Civil War. The battle began with an attempt of General Robert Lee of Confederate, trying to invade Northern States. The battle began in summer of 1863. Lee lost the battle.

The Battle of Appomattox was the last battle of the American Civil War. The war ended with the surrender of Confederate General Robert Lee.

So, the correct sequence is A, D, B, and C.