After humiliating the two hostile cities of Arezzo and Pisa, the Florentine Republic had overthrown the Ghibellines and assured the triumph of the Guelphs throughout Tuscany, and thus gained almost unlimited influence, both political and commercial. Hence there was a vast and rapid increase of prosperity. Great festivities and banquets were held in all the wealthiest houses, and palace courtyards, covered with silken canopies and draped with gorgeous stuffs, served as places of entertainment for the citizens. In token of rejoicing the womenfolk paraded the streets wearing garlands of flowers. Nevertheless, there was a general wish to continue the war, in the hope of completing the overthrow of the two most powerful Ghibelline cities. This, however, was no easy task. In 1289 there were fresh skirmishes between the Guelphs and Ghibellines, although none of any importance. The Florentines made several attempts to capture Arezzo by force and by fraud, but always in vain. In November they had contrived a secret arrangement by means of which it was hoped to surprise the city. A decree was suddenly issued summoning all able-bodied men to assemble outside the walls before a candle lighted at one of the gates should have time to burn down. The army thus hastily gathered made a forced march on Arezzo; but the treason plotted there had been already discovered: a dying man, rumour said, having revealed it to his confessor. At any rate, the army was obliged to withdraw from a bootless errand. In the June of the ensuing year, 1290, the Florentines resumed the campaign with an army of 1,500 horse and 6,000 foot, furnished by the League. Surrounding Arezzo, they devastated the territory within a circuit of six miles, for the space of twenty-nine days, but without achieving any farther result. At that period all cities were fortified, and before the invention of gunpowder siege operations had no chance of success, save by treason, against a resolute defence. Now, too, the Florentines were trying to carry on a double campaign, against Arezzo on the one hand and Pisa on the other. In fact, presently leaving three hundred horse and a considerable number of foot soldiers to garrison the neighbouring strongholds, they transferred the rest of the army from the Upper to the Lower Val d'Arno, to act against Pisa.