Thus the whole of Tuscany was divided between the Guelph and Ghibelline factions. The exiles, together with some German soldiers who had served under Frederic II., occupied the Castle of Montaia, belonging to Count Guido Novello, in the upper Val d'Arno. The Florentines marched to the assault of the stronghold towards the end of the year, but were ignominiously repulsed. On their return to the city, they rang the alarm-bell, collected a large force, again took the field, people and Commune combined, and pursued the war with energy during the month of January, regardless of frost and snow. The general condition of affairs in Tuscany enlarged the proportions of this war; for on the one side Lucchese troops co-operated with the Florentine army, while the exiles on the other received reinforcements from Pisa and Sienna. The First Popular Government now proved its mettle. The adversaries were driven off, the Castle of Mentaia captured and demolished, and its defenders were led captives to Florence in January, 1252.[253] The Florentines then marched into the Pistoian territory, laid it waste, and halted to attack the Castle of Tizzano on their return. But while thus engaged they heard that the Pisans, having routed the Lucchese, were moving homewards with prisoners and spoil. Accordingly, they raised the siege, hastened in pursuit, and giving battle to the Pisans at Pontedera on July 1, 1252, completely defeated them. Even the Podestà of Pisa was captured, and another curious incident took place. The Lucchese prisoners who were being dragged to Pisa in bonds not only regained their liberty, but were enabled, by the help of the Florentines, to convey to Lucca as captives the same Pisans by whom they had been previously seized. Meanwhile, profiting by the absence of the Florentine troops, the exiles and Count Guido Novello had taken refuge at Figline and made it the centre of continual skirmishing expeditions. Hence it was indispensable to unearth them all without delay. The town surrendered, but only on condition that the strangers defending its wall should be allowed to go free, and the exiles readmitted. This was granted but then, in violation of the stipulated terms, Figline itself was sacked and burnt (August, 1852).[254] But, the Siennese having simultaneously profited by the opportunity to lay siege to Montalcino, a border fortress always claimed by the Florentines, the latter hastened to its relief, and after routing its assailants and providing everything for the future defence of the stronghold, marched back to Florence in triumph.