First Olynthian War
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Was a war between Sparta and the Chalcidian League.
Chronology
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January 378 BC: The Spartan Army of king Agesilaus II occupied Olynthus.
January 399 BC: The Macedonian capital of Pella fall into the hands of the Chalcidicean League's forces.
January 378 BC: As a result of the Olynthian War, the Chalkidiki League was dissolved by Sparta, and most of the cities of Chalkidike and the Chalkidiki League came under the sovereignty of the Macedonian king Amyntas III.
Selected Sources
Assumption: most of the Chalcidian cities aren't citied after the Olynthian war, so we interpret the dissolution of the League with most of the Chalcidian Peninsula falling into the sphere of influence of Macedon.
Buckley, T. (1996): Aspects of Greek History, 750-323 BC: A Source-based Approach, Psychology Press, p. 330
Xenophon. Greek History, V, 2, 13
Xenophon. Greek History, V, 3, 26