The Rothschild family pioneered international finance in the early 19th century. The family provided loans to the Bank of England and purchased government bonds in the stock markets. Their wealth has been estimated to possibly be the most in modern history. In 1804, Nathan Mayer Rothschild began to deal on the London stock exchange in financial instruments such as foreign bills and government securities. From 1809 Rothschild began to deal in gold bullion, and developed this as a cornerstone of his business. 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. His four brothers helped co-ordinate activities across the continent, and the family developed a network of agents, shippers and couriers to transport gold—and information—across Europe. This private intelligence service enabled Nathan to receive in London the news of Wellington's victory at the Battle of Waterloo a full day ahead of the government's official messengers.