A thread follows one event or historical theme across the archive, wherever and whenever it appears. Pick a tab to read one; they are in the order they are filed on the timeline. Pulling a thread opens up a narrowed timeline view filtered to every year that thread touches.
A decisive naval engagement in the straits of Attica where a smaller Greek force comprised of allied city-states under the leadership of the Athenian statesman, Themisocles, were able to defeat the larger Achaemenid Persian invasion force of Xerxes I, accordingly helping to turn the tide of the Greco-Persian Wars toward the Greeks' favor.
A famed holding action and last stand at the pass of Thermopylae, where a small allied force of a few thousand Greeks, and famously 300 Spartans under King Leonidas of Sparta delayed the Persian advance of King Xerxes I during the Greco-Persian Wars.