While the army, of which the ROYAL Regiment formed part, was engaged in operations in the Netherlands, the Elector of Bavaria took arms against the Emperor of Germany; and a French force commanded by Marshal Villiers having traversed the Black Forest and joined the Bavarians, the united armies were making considerable progress in the heart of Germany. This event occasioned the ROYALS, with a great portion of the English and Dutch forces under the Duke of Marlborough, to transfer their services from the Low Countries to Germany, to arrest the progress of the French and Bavarians. [Sidenote: 1704] Previous to quitting the Netherlands, the regiment sent a detachment of six hundred men to Maestricht to garrison that city, while the Dutch troops were working at the entrenchments on the heights of Petersberg. In the early part of May, 1704, the remainder of the regiment marched from its winter quarters towards the Rhine, and was joined at Bedburg by the detachment from Maestricht. On the 19th of May the army directed its march from Bedburg along the course of the Rhine towards the Moselle, and traversed both rivers at Coblentz on the 25th and 26th of that month; thence proceeding towards the Maine, arrived at the suburbs of Mentz in the beginning of June; the cavalry being in advance with the Duke of Marlborough, the infantry and artillery a few stages in the rear under General Charles Churchill. From the Maine the infantry directed its march through the Landgraviate of Hesse, towards the Neckar, passed this river on the 15th of June, and proceeding in the direction of the Danube, was soon afterwards at the seat of war in Germany, and co-operating with the forces of the empire.