A number of weapons were introduced during the Civil War.
Rifled artillery, invented during the 1840s, was developed to the point of being useful and first deployed to effect in the Civil War. Most, but not all, of these were muzzle loaded.
Breachloading rifles with brass cartridges were first used for warfare in the Civil War.
Repeating Rifles were also first introduced in the Civil War.
The Civil War was the first conflict in which revolvers loaded with brass cartridges were used.
Longbow, I think
Corn
During the US Civil War one weapon was the most used one by the Union infantry. This was the 1861 Model of the Springfield rifle.
Atlanta,GA
Wm. T. Sherman
Sonar was not introduced in World War 1.
it was the mini ball IMPROVEMENT The repeating rifles and carbines.
musket
547
Penises and AA12's were Introduced 1 year into the Civil war which lasted 8 years.
pistol
During which war?