Why was it important for the Confederates to attack the Union garrison at Winchester? A. They needed to capture prisoners.
B. They needed more uniforms.
C. They needed to capture ammunition.

Explanation:

it was important for the Confederates to attack the Union garrison at Winchester because  The Confederates commanded by General P.G.T. Beauregard attacked the Union at Fort Sumpter on April 12, 1861. Garrison commander Major Robert Anderson surrendered on April 13, 1861.

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

i believe your answer is d)