All wars and conflicts

Thirty Years' War

11 countries took part.

Read about Thirty Years' War on Wikipedia

Country	Years
Austria	1618 to 1648
Czech Republic	1618 to 1648
Denmark	1618 to 1648
France	1618 to 1648
Germany	1618 to 1648
Hungary	1618 to 1648
Italy	1618 to 1648
Kingdom of the Netherlands	1618 to 1648
Poland	1618 to 1648
Spain	1618 to 1648
Sweden	1618 to 1648