A newly uncovered Viking fortress on Zealand Denmark's largest island are shaped like a ring and may have served as a military training ground for Viking attacks on England

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Explanation:

A Viking fortress newly discovered on Zealand, Denmark's largest island, might have served as a launching-off point for Viking attacks on England, the Telegraph reports. The fortress is shaped like a ring and is the fifth of its kind to be discovered. All five are in Denmark.  

This, however, is also the first fortress of its kind that archeologists have found in more than 60 years, and, at 475 feet in diameter, it's the third largest ever discovered.

an argumentative essay presents objectively a topic and its main characteristics. besides, it states all this information and facts by giving authentic and substantiated proof to the audience. by contrast, a persuasive text purpose is to convince the audience about some facts by presenting them according to his/her emotions and feelings. the main purpose of a persuasive text is to convince the audience to agree with the author´s opinion. on the other hand, in the argumentative essay, the author leads the writer to recognize his/her point of view as the correct one.