What term describes a raid or invasion into a foreign territory?

The term that specifically describes a raid or invasion into a foreign territory is "incursion." This word implies not only an entry into another's domain but also carries connotations of a sudden and often aggressive or violent nature. Incursions are generally characterized by a temporary or limited engagement, often for the purpose of reconnaissance, disruption, or quick strikes, distinguishing them from a full-scale invasion which involves a more extensive and prolonged occupation.

Understanding "incursion" in this context highlights the nature of these actions as they relate to military operations or conflicts, particularly when discussing tactics that involve quick, targeted movements into enemy territory. This term effectively captures the essence of brief and concentrated military actions that don't necessarily aim for total control over the area like a traditional invasion would imply.

The other terms—such as invasion, intrusion, and infraction—while related in context, do not convey the same specific meaning as "incursion" does in relation to the context of a sudden and aggressive entry into foreign land.