About the end of September, 1740, while they were still busily engaged in making astronomical observations at one of the extremities of the arch of the meridian, which had been measured, Ulloa and Don George Juan were suddenly called to Lima by an order of the viceroy. War had just been declared between England and Spain, and the expedition under Lord Anson menaced the seacoasts of the Spanish possessions in South America. Ulloa and Juan were therefore commissioned to put the principal points in the neighbourhood of Lima in a state of defence; after which they obtained permission to return to Quito, to resume their scientific observations. But scarcely had they traversed the mountains, and arrived at the scene of their labours, when they were recalled to the coast, the sack of Payta by the English fleet having spread a universal panic through the country. This visit of Ulloa to Guayaquil was brief; but he had no sooner returned to Quito than he was once more ordered to repair, with George Juan, who had been detained in Guayaquil, to Lima. Here they were honoured with the command of two frigates, with orders to cruise along the coasts of Chili and the island of Juan Fernandez. The arrival of certain Spanish reinforcements at Lima at length rendered it practicable for them to return to their scientific occupations at Quito, from whence all the French academicians had departed, except Godin, in conjunction with whom they observed the comet of 1744. They were now become impatient to revisit Europe, with the results of their labours, and embarked at Callao, on board of two French ships, which were about to sail by the way of Cape Horn, for Brest. The two ships were separated by tempests. The one in which Ulloa was embarked shortly after this fell in with two other French ships, in company with which it was attacked by two English privateers, when it with difficulty escaped, leaving its companions, with three millions of piastres, in their hands. To avoid a similar fate, they now directed their course towards the coast of North America. But on reaching the port of Louisburg, at Cape Breton, while the crew were congratulating themselves on their escape from so many dangers, they were compelled, without firing a gun, to strike to the English, who had just rendered themselves masters of that city.