We have now some insight into the essential motives of Florentine history in the thirteenth century. But another step is needed before we can understand the form which the factions took. It would be a fatal error to suppose that the Ghibellines were soldiers and the Guelfs merchants, and that as each faction triumphed in turn Florence expelled her merchants and became a military encampment, or expelled her soldiers and became a commercial emporium. Such a course of events would be absolutely impossible. The truth is, that the main part of the faction fighting and banishing was done on both sides by the magnates themselves. The industrial community went on its way, sometimes under grievous exactions, sometimes under a friendly Government, always subject to the insolence and violence of the magnates, though in varying degree, but always there, and always pursuing its business occupations. It came about thus. We have seen that in the twelfth century the nobles within Florence were on the whole fairly conscious of having common cause with the merchants, but that the very success of her external undertakings brought into the city a more turbulent and hostile order of nobility. On the other side, rich and powerful merchants pushed their way up into recognition as magnates, while retaining their pecuniary interest in commerce. Thus in the thirteenth century the body of magnates itself became divided, not only into clans, but into factions. It always seemed worth while for some of them to strengthen their alliances with the territorial magnates, the open foes of the city, in order to strengthen their hold on the city itself; and it always seemed worth while for others to identify themselves more or less sincerely with the demands of the people in order to have their support in wrenching from their fellow magnates a larger share of the common spoil. It was here that the absence of any uniting principle or constructive purpose amongst the magnates told with fatal effect. Indeed their house was so divided against itself that the people would probably have had little difficulty in getting rid of them altogether, had they not been conscious of requiring a body of fighting men for service in their constant wars. The knights were at a certain disadvantage in a street fight in Florence, but the merchant statesmen knew well enough that they could not do without them on a battle-field.