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it was a fight :]
The true potential of the rifles available during the Civil War was not used because Generals on both sides insisted on using old tactics, without tacking the ability of their weapons into account.
Naval battle
If the question is asking about the Civil War battle with the highest death toll, I believe it was the Battle of Antietam.
The Merrimac and the Monitor Battle OR the Ironclad Battle
it was a fight :]
Tactics are the small decisions that concern a battle. Strategy is the larger plan affecting a whole war or campaign. Bad tactics for the south were frontal attacks versus entrenched troops. I feel it is their strategies that failed them (outdated Napoleonic warfare in a modern age).
No, the deadliest battle of the Civil War was that of Gettysburg.
Early ancient Greek battle tactics are identified as "shock tactics". Before archery, javelins and heavy cavalry were employed by the Greeks, the basic battle tactic was fighting hand to hand with unsophisticated weapons of war. Three thousand years later, the soldiers of the US Civil War had highly developed weapons and sophisticated battle tactics. With that said, however, "shock tactics" lived on through the millenniums. Soldiers in the US Civil War had a weapon for "shock tactics" and when fighting in close quarters, the fixed bayonet was the instrument of "shock value".
Rifle
Yes, because the tactics were based in 19th Century tactics, similar to those use in the American Civil War (which were outdated even at that time), but now faced with forces fighting in entrenched positions, and with much more capable weaponry.
The Battle of Gettysberg
European generals invested heavily in the power of mobility in their battle tactics. During the US Civil War, mobility did indeed prevent a defeated army to escape destruction, however, ahead of mobility was entrenchments and the value of defense coupled with a counterattack.
The Union won this battle.
The battle of Gettysburg.
The Battle of Hampton Roads.
The Battle of Antietam (Battle of Sharpsburg) .