patrouillon
Patrouillon is a term that can refer to several things, primarily related to military or security contexts. Most commonly, it signifies a patrol or a reconnaissance mission carried out by a unit, whether it be ground troops, naval vessels, or aircraft. The purpose of such a patrouillon is to observe an area, detect any enemy activity, maintain security, or gather intelligence. The specific objectives and methods of a patrouillon can vary greatly depending on the environment, the mission's criticality, and the resources available.
In a naval context, a patrouillon often involves ships or submarines monitoring territorial waters, international shipping
The term can also be used more broadly to describe any organized group moving through an area