Answer:
Strategy and tactics
In grand strategic terms, the Union needed to be on the offensive in order to conquer the South. Yet the South took the offensive whenever it could. General Lee invaded Maryland and Pennsylvania in the summers of 1862 and 1863, taking the war onto northern soil, in part because there was huge popular pressure on both sides to be seen to be on the attack.
However, technological innovations gave defending forces much greater tactical strength. Whereas in the Mexican War the army was still using smooth-bore muskets, by 1861 the use of rifled muskets and new conical-shaped bullets called Minié balls greatly increased the accuracy of firepower from a longer range. Towards the end of the war, entrenchments and barbed wire – notably in the long siege of Petersburg – made the conflict resemble the Western Front in the First World War.
Nevertheless, offensives against well-defended positions could still succeed when commanders not only had a numerical advantage but were also prepared to be persistent and flexible – as Grant and Sherman proved in 1864, and as British generals on the Western Front learned after 1916.
Battle of Bull Run, 1861
One of the main reasons a political conflict turned to war was that, in 1861, the vast majority of Americans were not trying to seek an accommodation; they wanted a fight. A few wise heads on both sides knew that once war came it would be long and costly. For many, though, resorting to violence was not a sign of failure but a manly, healthy, possibly even purifying way of resolving an intractable conflict.
The Confederate government was established in Richmond, Virginia, less than 100 miles due south of Washington. Northern newspapers emblazoned, “Forward to Richmond!” atop their editorial pages. Volunteer troops gathered in Washington in their makeshift uniforms. On all sides the expectation was that one quick and decisive battle would probably decide the fate of the rebellion.Instead, the first big confrontation between North and South was a chaotic battle outside Washington, near Bull Run creek, on 21 July 1861. The cavalry on both sides seemingly operatedat random, certainly without any proper co-ordination with infantry attacks. Troops mistook units on their own side for the enemy. After an inconclusive few hours of fighting, the Union army was sent into a panic-stricken retreat by a Confederate attack.
The losses in this first great conflict were tiny compared to the carnage of later battles, yet at the time casualty figures of 1,982 Confederate troops and 2,896 Union soldiers shocked both sides profoundly. While southerners rejoiced at victory, northerners were forced to confront for the first time the scale of the undertaking they had so blithely embraced.
