Florence already had an industry, the cloth industry. Florentine merchants (traders) traded with Lombard traders from the north of Italy. They bought English wool and Chinese silk to be woven into the most magnificent cloth in Europe at the riverside factories of Florence. Florence was perfectly sited for making cloth. A lot of water is needed to make cloth. Other towns nearby are high on the tops of hills, but Florence is in a wide valley, with the broad Arno River flowing through it. There was a harbor on the coast near Pisa. The Pisans were not very friendly towards Florence, so Florence took them over. Then the rich traders of Florence could have their own ships and did not have to worry about the Lombard traders who brought their goods across Europe and over the mountains on the backs of donkeys.