This is the league structure currently in operation; comprising 60 teams that are divided geographically in three groups of 20 each. At the end of each season, four teams are promoted to Serie B (three group winners, plus one coming from a promotion playoff involving the three group runners-up).
Promotion and relegation\n\n At the end of the season, three teams are promoted to Serie A and four teams are relegated to Serie C. The top two teams are automatically promoted and the third place team is only automatically promoted if they are more than 14 points clear of the fourth placed team.
The First World War tank developed from the interest of some military officers in the marriage of tractors with caterpillar tracks as a means of crossing trench obstacles and breaking through barbed wire.
The idea was to create a heavily armored vehicle capable of crossing trenches and withstanding enemy fire while providing offensive firepower. The first tank, known as "Little Willie," was built in 1915, and it laid the foundation for the development of modern tank warfare.