Swiss soldiers continued to serve as valued mercenaries with a number of European armies from the seventeenth to the nineteenth centuries, in spite of extensive changes in tactics, drill and weapons. The most consistent and largest-scale employer of these troops was the French army, where the Swiss formed an elite part of the infantry. The Swiss Guards regiment, the most senior of the twelve Swiss mercenary regiments in French service, was essentially identical to the French Guards in organization and equipment, other than wearing a red uniform as opposed to the blue coats of the French corps. The Swiss adopted the musket in increasingly large numbers as the seventeenth century wore on, and abandoned the pike, their ancient trademark, altogether at around the same time as other troops in the French army, circa 1700. They also served in the New World: Samuel De Champlain's map of the Île Sainte-Croix (Saint Croix Island) settlement shows a barracks for the Swiss.