Danish Auxiliary Corps in the Williamite War in Ireland
The Danish Auxiliary Corps was a corps of 7,000 Danish soldiers sent to fight with William of Orange who was at war in Ireland. Disappointed with his alliance with France's King Louis XIV, Christian V of Denmark–Norway in 1689 entered into a treaty of military assistance with King William III of England.
Source: Wikipedia — Danish Auxiliary Corps in the Williamite War in Ireland (CC BY-SA 4.0)