Question

on may 1-5, 1863, the union and the confederacy fought at antietam first battle of bull run chancellorsville

Explanation:

The battle fought from May 1 - 5, 1863, between the Union and the Confederacy was the Battle of Chancellorsville. Antietam was fought in 1862, and the First Battle of Bull Run was in 1861.

Answer:

Chancellorsville