Prior to the development of antibiotics during World War 2 the biggest reason for the huge casualties suffered by armies during battles was infections of wounds and other battlefield injuries.
All battles are battles of armies.
The Brusilov Offensive in Russia had an estimated 1,600,000 casualties and resulted in the nearly complete destruction of the Ausro-Hungarian armies on the Eastern Front. It was one of very few victories for the Russians in the war.(the casualties in the Brusilov Offensive are about equal to the casualties for the Somme and Gallipoli battles combined)
Grant was winning battles, or at least wearing down the Confederate armies, who did not have the manpower resources of the Union. The North could have greater casualties and still win.
Because they were places where Germany's armies in North Africa and Russia respectively suffered their first major defeat.
During the war, armies fought huge battles in which thousands of soldiers died.
The armies were ready for battles.
When the armies fully surrendered
Both of those can happen.
Lincoln was the US President, directing the Union armies. These armies lost both the Battles of Bull Run.
No, Peter didn't fight ANY battles with anyone. He spread the word of Jesus PEACEFULLY.
The Confederate armies fought valiantly, however, the North had a much large army and had an industrial base to keep its forces supplied. The smaller Southern population could not afford the casualties the North was able to absorb. Thus, the Southern armies grew weaker, even when victorious. Since the war was fought primarily in the South, the Confederate economy suffered as farms and their small industries became destroyed by invading Union armies.
Poor armor, dangerous weapons, and small armies to begin with