The Sea people
Railroad transport and communicating by telegraph, I guess. Ah yes, submarine warfare.
Enemy surface ships are the main target of submarine warfare
Germany hoped that submarine warfare would lead to war.
Anti submarine warfare
Germany's submarine warfare was unrestricted. These attacks led to World War I.
Submarine warfare has existed since the early 1900's, and continues to this day. Though the last ship sinking by a submarine was in the Falklands War, the evolving missions of submarines have taken submarine warfare well beyond just sinking ships and submarines.
submarine warfare
USA
unrestricted submarine warfare
No, anti-submarine warfare (ASW) and submarine warfare are not the same. ASW focuses on detecting, tracking, and neutralizing enemy submarines to protect naval forces and shipping lanes. In contrast, submarine warfare involves the offensive operations conducted by submarines, including attacking surface ships and engaging in strategic missions. Each has distinct strategies, technologies, and objectives within naval operations.
WW1 introduced submarine warfare, tanks, chemical warfare, and aerial combat. Man's history already knew battleship warfare from Tsushima in 1905; and massed land warfare consisting of infantry. WW2 REFINED submarine warfare, tanks, and aerial warfare; chemical warfare was outlawed by treaty.
One of the first instances of lost US lives in WW1, and introduced the US to unrestricted submarine warfare; as well as a public cry against UN-restricted sub warfare.