In addition to supporting the wars in the Holy Land, the navy played a vital role in the Genoese rivalry with the nearby Republic of Pisa, which competed with Genoa for influence in Corsica and Sardinia. It was common for the Italian maritime states to prey on their rival's merchant shipping, and the Genoese navy was known to both suppress and participate in this practice. In 1119 a Genoese squadron raided a Pisan merchant convoy, beginning the first of the Genoese-Pisan Wars. The first of the wars ended inconclusively, but resulted in a century of raiding and piracy as both cities fought over Corsica and Sardinia. In the 1230s a second, undeclared war erupted between Genoa and Pisa as part of the wider Guelphs-Ghibellines Conflict. The Holy Roman Emperor sided with Pisa when the war broke out, forcing Genoa to find allies abroad. The republic sided with the Pope (who was at the time in a dispute with the Holy Roman Emperor), and sent a fleet to transport a Guelph army to Rome in a show of support for the papal cause. The Ghibellines discovered the plan and, along with a Pisan fleet, intercepted the Genoese navy at the Battle of Giglio in 1241. Weighted down with passengers and baggage, the Genoese navy lost 3 galleys sunk and 27 captured. The second war with Pisa ended in a white peace in 1243.