Who does Rikki fight with in the Great War?

In Rudyard Kipling's "Rikki-Tikki-Tavi," Rikki, the mongoose, primarily fights against the cobras Nag and Nagaina. These snakes pose a threat to his human family in their garden, prompting Rikki to defend them. His battles with Nag and Nagaina showcase his bravery and determination to protect his home.