The Battle of Grand Gulf was fought on April 29, 1863, during th: The United Kingdom is famous for the tradition of 'British Empiricism', a branch of the philosophy of knowledge that states that only knowledge verified by experience is valid, and 'Scottish Philosophy', sometimes referred to as the 'Scottish School of Common Sense'.[422] The most famous philosophers of British Empiricism are John Locke, George Berkeley[t] and David Hume; while Dugald Stewart, Thomas Reid and William Hamilton were major exponents of the Scottish "common sense" school. Two Britons are also notable for the ethical theory of utilitarianism, a moral philosophy first used by Jeremy Bentham and later by John Stuart Mill in his short work Utilitarianism.[423]