Gold, securities trading and the Napoleonic Wars
From 1809, Rothschild began to deal in gold bullion and developed this as a cornerstone of his business, which was to become N. M. Rothschild & Sons. From 1811 on, in negotiation with Commissary-General John Charles Herries, he undertook to transfer money to pay Wellington's troops, on campaign in Portugal and Spain against Napoleon, and later to make subsidy payments to British allies when these organized new troops after Napoleon's disastrous Russian campaign.
Later, during the 1840s, as early socialists in France (such as Alphonse Toussenel and Pierre Leroux) attacked the Rothschilds and "Jewish financiers" in general, a French socialist from among their circle, Georges Marie Mathieu-Dairnvaell using the penname "Satan", authored a work entitled Histoire édifiante et curieuse de Rothschild Ier, Roi des Juifs ("Edifying and Curious History of Rothschild the First, King of the Jews"). Within it, he made claims about Nathan Mayer Rothschild's early knowledge of the outcome of the Battle of Waterloo, whose couriers delivered information about the victory back to London before the British Cabinet itself knew, claiming that he used this knowledge to speculate on the London Stock Exchange and make a vast fortune by unfair advantage against the other British stock holders, essentially defrauding them.
Frederic Morton relates the story thus:
To the Rothschilds, [England's] chief financial agents, Waterloo brought a many million pound scoop. ... a Rothschild agent ... jumped into a boat at Ostend ... Nathan Rothschild ... let his eye fly over the lead paragraphs. A moment later he was on his way to London (beating Wellington's envoy by many hours) to tell the government that Napoleon had been crushed: but his news was not believed, because the government had just heard of the English defeat at Quatre Bras. Then he proceeded to the Stock Exchange. Another man in his position would have sunk his work into consols [bank annuities], already weak because of Quatre Bras. But this was Nathan Rothschild. He leaned against "his" pillar. He did not invest. He sold. He dumped consols. ... Consols dropped still more. "Rothschild knows," the whisper rippled through the 'Change. "Waterloo is lost." Nathan kept on selling, ... consols plummeted – until, a split second before it was too late, Nathan suddenly bought a giant parcel for a song. Moments afterwards the great news broke, to send consols soaring. We cannot guess the number of hopes and savings wiped out by this engineered panic.
The Rothschild family and others have claimed that this embellished version of events originated in Mathieu-Dairnvaell's 1846 writing, was further embellished by John Reeves in 1887 in The Rothschilds: the Financial Rulers of Nations, and then repeated in other popular accounts like that of Morton and the 1934 American film directed by Alfred L. Werker, The House of Rothschild.
Historian Niall Ferguson agrees that the Rothschilds' couriers did get to London first and alerted the family to Napoleon's defeat, but argues that since the family had been banking on a protracted military campaign, the losses arising from the disruption to their business more than offset any short-term gains in bonds after Waterloo. Rothschild capital did soar, but over a much longer period: Nathan's breakthrough had been prior to Waterloo when he negotiated a deal to supply cash to Wellington's army. The family made huge profits over a number of years from this governmental financing by adopting a high-risk strategy involving exchange-rate transactions, bond-price speculations, and commissions.
It is also very commonly reported that the Rothschilds' advanced information was caused by the speed of prized racing pigeons, held by the family. However, this is widely disputed and the Rothschild archive states that, although pigeon post "was one of the tools of success in the Rothschild business strategy during the period c. 1820–1850,... it is likely that a series of couriers on horseback brought the news" of Waterloo to Rothschild.
More recently, Brian Cathcart has refuted the claim that Rothschild was the first man in London to know of the victory at Waterloo. He traces the earliest news to a dispatch Wellington sent via his messenger to Lord Bathurst, the Secretary of War, which was received on the evening of 21 June.