Supporters of using the atomic bomb at the end of world war ii believed that

Believed that it was the way to end the war

Explanation:

For the United States to end the war with Japan it had to invade mainland Japan. This was extremely hard even when compared to the D-Day invasion. They calculated that they would need to loose many men and Japan would lose even more soldiers and civilians. They settled on dropping the bombs for them to surrender. At the end this did not bring Japan to surrendering and the thing that pushed them to surrender was the USSR invasion that they could not defeat. And better to surrender to USA than to the USSR.

first second and third

explanation:

on the morning of  july 21,  1861, general mcdowell ordered the  unionarmy to attack. it was on this hill that  confederate  colonel thomas jackson and his forces held back theunion  troops.