How many Ottoman invasions did Skanderbeg repel between 1444 and 1466?

Between 1444 and 1466, the Albanian national hero Skanderbeg effectively repulsed 13 Ottoman invasions.1

After abandoning his service to the Ottoman Empire in 1443, Skanderbeg organized a league of Albanian princes in 1444 and served as their commander in chief. His resistance became legendary, particularly after he successfully defended against the forces of Murad II in 1450, earning him recognition throughout the Western world. Despite facing significant military pressure and the shifting alliances of the era, he maintained this successful defense until the end of his life.1