It was a mythological war fought between the Greeks and the people of Troy. It began after the Trojan prince Paris abducted Helen , wife of Menelaus of Sparta. It led to the Troyan Horse, where the Greeks made a giant horse, hid in it, and presented it as a gift to the city of Troy. Once the horse was inside the city, the Greeks attacked at night and won the war.
I'm not sure about the Great Britain and Us conflict but I do know that the Mexican American war was the war for the possession of Texas? That may be a contrast you may include. I hope this helps.