The term 'Group of Zulu Warriors' refers to an Impi, which is a four-letter word. An Impi is a Zulu regiment or army, consisting of warriors who are organized and led by a chief. The Zulu people are an ethnic group from South Africa, and their warriors were known for their bravery and skill in battle. The Impi was an important part of the Zulu military structure, and they played a major role in the Anglo-Zulu War of 1879.