Meanwhile, aided by General von Moltke and Count von Roon (rōn), Bismarck had built up a wonderful military power. Every man in Prussia had been trained a certain number of years in the army and was ready at a moment’s notice to join his regiment. The whole campaign against France had been planned months in advance. In France on the other hand, the illness and irritability of Napoleon III had resulted in poor organization. Men who did not wish to serve their time in the army were allowed to pay money to the government instead. Yet their names were carried on the rolls. In this way, the French army had not half the strength in actual numbers that it had on paper. What is more, certain government officials had taken advantage of the emperor’s weakness and lack of system and had put into their own pockets money that should have been spent in buying guns and ammunition. When at last Bismarck was all ready for the war, it was not hard to find an excuse. Old Queen Isabella of Spain had been driven from her throne, and the Spanish army under General Prim offered the crown to Prince Leopold of Hohenzollern, a cousin of the king of Prussia. This alarmed Napoleon, who imagined that if Prussia attacked him on the east, this Prussian prince, as king of Spain, would lead the Spanish army over the Pyrenees against him on the south. France made so vigorous a protest that the prince asked the Spaniards not to think of him any longer. This was not enough for Napoleon, who now proceeded to make a fatal mistake. The incident was closed, but he persisted in reopening it. He sent his ambassador to see King William of Prussia to ask the latter to assure France that never again should Prince Leopold be considered for the position of king of Spain. The king answered that he could not guarantee this, for he was merely the head of the Hohenzollern family. Prince Leopold, whose lands lay outside of Prussia, was not even one of his subjects. The interview between the king and the French ambassador had been a friendly one. The ambassador had been very courteous to the king, and the king had been very polite to the ambassador. They had parted on good terms. [Illustration: An Attack on a Convoy in the Franco-Prussian War.]