Captain D'Agoust was an officer of the group of Swiss soldiers what have served as guards at European courts since when?
Swiss Guards Swiss Guards (French: "Gardes Suisses" ; German: "Schweizergarde" ) are the Swiss soldiers who have served as guards at foreign European courts since the late 15th century.
Line regiment The line regiments formed the majority of the regiments in European standing armies in the early 20th century. These were all the regiments that did not have a specialist role - such as guards regiments. They are also often referred to as regiments of the line or, depending on the branch, as "infantry of the line", "line cavalry", etc.