Is a account of Julius victory against Spain primary or secondary source and why?

The account of Julius Caesar's victory against Spain is a primary source. This is because it was written by Julius Caesar himself in his Commentarii de Bello Gallico (Commentaries on the Gallic War). This work is a firsthand account of Caesar's military campaigns in Gaul and other parts of Europe, and is considered to be one of the most important historical sources from the ancient world. As a primary source, the Commentarii provides valuable insights into Caesar's military strategies and tactics, as well as his political and diplomatic dealings with the Gauls and other peoples he encountered.