The answer – well, an answer – is coal. How so? Generally, the take on the British victories tends to emphasize the fairly sorry state of the Qing military in terms of funding, equipment and training, and those forces’ huge disadvantage faced with massive broadsides of British ships and the lethal firepower of the British infantry’s muskets. It isn’t much commented on in the umpteen histories of the Sino-British wars in the 1840s and 1850s, but there was another huge advantage. For the second time in the history of warfare (everyone forgets about the 1st Anglo-Burmese War and the paddle steamer Diana) ships could be moved about independent of the wind. During the 1st Opium War, Britain was able to call on the services of not just one but 17 – yes seventeen – steam-powered warships. They could, and did, tow troopships when the wind failed. It was the same with the heavily gunned sailing ships of the line, which could be towed to where they were needed if there was no wind. The armed steamers, especially the shallow draft Nemesis, could go where the sailing vessels could not. No coal, no steam ships…and maybe a different outcome. In the 2nd Opium War almost all the British and French naval ships involved were either paddle or screw propelled steamers, so the technological advantage at sea, if not on land, was even greater because China’s navy had yet to modernize.