Yes, submarines were used by the Confederate Navy in the US Civil War.
No, not really, submarines were first used successfully in the Civil War.
Both the Union and the Confederate had submarines, but the Confederate used them more often.
As an ingenious new method of sinking warships.
One primitive submarine was used in the Civil War. It destroyed a Union ship but the sub also sank after its only attack.
Yes, they had crews.
the battle of butthed island
World War I submarines were primarily used to locate and attack surface cargo and warships.
submarines
periscopes are used for submarines and war tanks
They were used in the first world war in submarines. The are used now also for submarines and also war tanks. The outer coating of the periscope for the submarines were firm and waterproof for protection from the water pressure. As for the war tank the periscope is able to turn 360 degrees.
They were used by submarines to navigate when not in open waters, They were also used by submarines and anti-submarine ships to locate enemy submarines.