The first blow is half the battle.

Taking the initiative can secure a major advantage before a contest has fully developed. The violent wording is usually metaphorical: an early, decisive move may unsettle an opponent, shape circumstances, and make the remaining effort easier.

The saying values prompt action, but it does not promise that an opening success will settle everything. It advises preparing well and acting effectively at the outset, while recognizing that careful assessment or cooperation may matter more than simply moving first.

Use it for competition, negotiation, argument, or a demanding task where a strong opening can influence what follows. Its combative imagery suits situations framed as a contest; avoid it when that framing would seem needlessly aggressive or when care and cooperation are more important.