In 1287-1288 the third invasion of the Mongols into Lesser Poland, led by Nogai Khan and Talabuga, took place. Their forces, with the support of some Kievan Rus' principalities, were too great to be faced in battle, so the knights and population took refuge in the fortresses. Leszek traveled to Hungary to ask for help. This time, Lesser Poland was better prepared for the Mongol invasion than for the previous two incursions, with several more fortresses in Kraków and Sandomierz to defend the lands. The destruction, however, was quite significant.