How did Sparta respond to Athens' attack on Syracuse?

Sparta and its allies sent troops and a fleet to Sicily, and a series of inconclusive land and sea battles around Syracuse followed. Athens responded with thousands of reinforcements but they too failed to break the deadlock. ... Losses: Athenian, at least 40,000 dead or captured; Sicilian and Spartan, unknown.

Explanation:

Responding to a request from Syracuse, Sparta and Corinth sent aid, including an able military commander from Sparta, Gylippus, who took charge of Syracuse's defense. ... Sparta sent ships and troops to the eastern side of the Aegean Sea, and there in the winter of 413/412 the revolts against Athenian rule began.

world war i began in 1914, after the assassination of archduke franz ferdinand, and lasted until 1918. during the conflict, germany, austria-hungary, bulgaria and the ottoman empire (the central powers) fought against great britain, france, russia, italy, romania, japan and the united states (the allied powers). to new military technologies and the horrors of trench warfare, world war i saw unprecedented levels of carnage and destruction. by the time the war was over and the allied powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.

explanation:

north atlantic treaty organization.