"All the business of war, and indeed all the business of life, is to endeavour to find out what you don't know by what you do; that's what I called 'guess what was at the other side of the hill'"
About this Quote
The subtext is anti-romantic and quietly corrective. Wellington—often cast as the cool professional opposite Napoleon’s theatrical genius—frames competence as skepticism. You don’t “know” the enemy; you test hypotheses with action and watch what happens. In modern terms, it’s reconnaissance by decision: probe, observe the response, adjust. That’s why the quote works beyond the military. It refuses the comforting myth that expertise eliminates uncertainty. Even in “the business of life,” you learn what you didn’t know by committing to choices that generate feedback. Knowledge is the byproduct of action, not its precondition.
Context matters: this comes from a commander whose campaigns depended on logistics, coalition politics, and terrain as much as daring. After years of watching plans collapse on contact, Wellington elevates a pragmatic philosophy: humility paired with nerve. You cannot wait for perfect information; you can only earn better information by moving.
Quote Details
| Topic | Decision-Making |
|---|---|
| Source | Help us find the source |
| Cite |
Citation Formats
APA Style (7th ed.)
Wellington, Duke of. (2026, January 18). All the business of war, and indeed all the business of life, is to endeavour to find out what you don't know by what you do; that's what I called 'guess what was at the other side of the hill'. FixQuotes. https://fixquotes.com/quotes/all-the-business-of-war-and-indeed-all-the-9549/
Chicago Style
Wellington, Duke of. "All the business of war, and indeed all the business of life, is to endeavour to find out what you don't know by what you do; that's what I called 'guess what was at the other side of the hill'." FixQuotes. January 18, 2026. https://fixquotes.com/quotes/all-the-business-of-war-and-indeed-all-the-9549/.
MLA Style (9th ed.)
"All the business of war, and indeed all the business of life, is to endeavour to find out what you don't know by what you do; that's what I called 'guess what was at the other side of the hill'." FixQuotes, 18 Jan. 2026, https://fixquotes.com/quotes/all-the-business-of-war-and-indeed-all-the-9549/. Accessed 9 Feb. 2026.









