The Church Pennant as used by the Royal Navy, European Navies, and Commonwealth Navies, is a broad pennant combination of the English Flag at the hoist and the Dutch National Flag in the fly originating from the Anglo-Dutch wars of the late 17th century on Sundays to indicate that a service was in progress and a ceasefire existed between the warring nations, hence the origin of the pennant. The Royal Navy of the United Kingdom is the oldest of the British armed services (and is therefore known as the Senior Service) The Flag of England is the St George's Cross. The red cross appeared as an emblem of England during the Middle Ages and the Crusades and The Flag of the Netherlands is a horizontal Tricolour of Red, White, and Blue. The Anglo-Dutch Wars ( Dutch: Engels-Nederlandse Oorlogen or Engelse Zeeoorlogen) were fought in the 17th and 18th centuries between England It is flown on ships and establishments (bases) during religious services.