Analysis of information sources in references of the Wikipedia article "Quốc kỳ Đan Mạch" in Vietnamese language version.
Many predominantly Christian states show a cross, symbolising Christianity, on their national flag. Scandinavian crosses or Nordic crosses on the flags of the Nordic countries–Denmark, Finland, Iceland, Norway and Sweden–also represent Christianity.
The Christian cross, for instance, is one of the oldest and most widely used symbols in the world, and many European countries, such as the United Kingdom, Norway, Sweden, Finland, Denmark, Iceland, Greece and Switzerland, adopted and currently retain the Christian cross on their national flags.
Legend states that a red cloth with the white cross simply fell from the sky in the middle of the 13th-century Battle of Valdemar, after which the Danes were victorious. As a badge of divine right, Denmark flew its cross in the other Scandinavian countries it ruled and as each nation gained independence, they incorporated the Christian symbol.
