The Tsamikos dance originated in particular tribes (Arvanites), living in what is today Hellas (Greece); having arrived in the 13th century. They were Hellenized around the 16th century. It was a martial dance.
The Tsamikos can now be classified as one of the Panhellenic dances. It is performed by attendees at many cultural functions, both in the Hellenic Diaspora and in Hellas (Greece), by both men and women. Generally speaking, the fact that it was a martial dance (Πυρρίχιος) is not recognized. It is, though, highly accessible to all.
During the Greek War of Independence, it was danced before and after battles by the warriors fighting to free their people. Many of these warriors were descended from the aformentioned tribes that were "Hellenized" in the 16th century.
Here are two versions of the dance. The 1st shows how it is performed in cultural gatherings (as described). The second instance shows a version by a dance troupe where it has retained more of its martial characteristics per the definition. Note the faster tempo. It is intended that the first version of the dance, due to its accessibility, simplification and slower tempo will be more easily taught to youth. For many youth in the Diaspora (the large number of whom are 3rd and 4th generation) it will be their first introduction to Hellenic (Greek) dance in general.