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Control of the seas is correct.
The Union Army's strategy at the Battle of Antietam was to keep the army intact to avoid being flanked by the Confederacy.
<h3>What did the Union do at the Battle of Antietam?</h3><h3 />
At the Battle of Antietam, the Union Army knew that the Confederates would attempt to flank them by dividing their army. They knew this because they had found out General Lee's plans in advance.
As a result, the Union Commander, Gen. George B. McClellan, kept the army intact while trying to attack the flanks of the enemy. General Lee then attacked with all his force thinking that the Union would see this and fall back.
The Union responded by standing their ground and driving back the Confederate army. The strength of this strategy was that it won the battle for the Union. A limitation was that it cost many lives.
Find out more on the Battle of Antietam at brainly.com/question/22800846
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