Hi
AtheistDane,
Yes, I have a few key points that I think you need to stress, and ought to help you produce an interesting peice.
1. The ACW inspired a rapid development in firearms technology. At the start of the war the majority of troops were armed with the same type of smooth bore, mussle loaded weapons that had been used in the American War of Independence, but by the end of the war the percentage of rifled, breachloaded and rapid firing weapons had increased significantly. Increasing the lethality of warfare and forcing a change in tactic's towards more extended formations and greater use of cover.
2. As mentioned above tactic's evolved rapidly to more extended formations and more rapid movement. Earlier armies using purely smoothbore weapons had usually fought shoulder to shoulder in dense formations that advanced at an artificially slow pace (76 paces per minute for the British), but as the weapons became more lethal such tactic's would have been suicide in an ACW battlefield and so most units adopted a much more extended line and advanced at a much faster pace. (see Pickets Charge for detail)
3. Naval warfare saw the first experimentation with iron warships, armoured warships, deck mounted turrets, low profile deck plans, breachloading cannon, percussion shells and submarine warfare. Huge developments which were to shape thinking in naval warfare until the advent of the Aircraft Carrier.
4. The ACW was also the first war in history where it was openly acknowledged that civilians and civilian property was a legimate target. Hence in theoretical terms it was the first application of the doctrine of 'Total War', where destruction of a countries ability to sustain itself and its war effort was as much a goal as the destruction of its armies. See General Sherman, and Sherman's march to the sea,
'You cannot qualify war in harsher terms than I will. War is cruelty, and you cannot refine it; and those who brought war into our country deserve all the curses and maledictions a people can pour out.' William Tecumeseh Sherman - Army of the Tennessee and Military Division of the Mississippi.
5. You might also wish to mention the impact of the railroad on both the logistic's, strategy and conduct of the war. The ACW was the first major conflict where the area of operations was heavy serviced by railways. They had a major impact on the Union strategy for prosecuting the war and their destruction had a major impact on the operations of the South. Several major battles were fought over railroad junctions, and their associated storage of supplies, some historians even point out that Union strategy was so highly tied to major railroad links that it enabled the South to anticipate Union army movements and much easier for them to mass their armies in the right locations to meet them.
Basically, if you covered all those points in detail, you wouldn't have an English Essay, you'd have a book. Good Luck, hope you get a good mark.