In 1921–22, the Portuguese clubs started playing a new national competition. The Campeonato de Portugal, played on a knock-out-basis (similar to the current Taça de Portugal), was the first national competition. After competing in the regional championships, the regional winners competed together to pick the Champion of Portugal. Marítimo make 13 appearances in the 17 editions of the competition.Lisboa, Agosto 2007 "Guia de Futebol 2007/2008", editado pelo Jornal Record, pág.112 After several attempts, the club finally won the Campeonato de Portugal in 1925–26. In the semi-final against Porto, Marítimo won 7–1, and in the final against Belenenses Marítimo won 2–0. It was after this great achievement that Marítimo was called "The Greatest of the Islands".
