As a youngster, David (the later king of Israel), slew Goliath, a giant, who was the champion of Israel’s enemy, the Philistines. "David and Goliath" became a metaphor for an underdog who nevertheless is victorious over a more powerful opponent and is particularly applied to sports stories and to larger corporate entities raiding smaller ones in takeover bids; sometimes the latter successfully resist incorporation.
This is a companion discussion topic for the original content at https://www.worldhistory.org/article/1816/david--goliath/.