Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The entry of an Argentinian XV into the competition stems from a decision by the New Zealand Rugby Union not to assemble its 'A' team, the Junior All Blacks, in 2008; as a consequence, the New Zealand Māori, who have taken part in the last three Churchill Cup tournaments, replaced the Juniors in the Pacific Nations Cup and were not available for the Churchill Cup.
Format
The teams were split into two pools of three teams each. Within each pool, the teams played one another once. All six teams participated in a finals day: the two pool winners competed in the final for the Churchill Cup, the two runners-up played in a Plate final, and the two bottom-placed teams competed for a Bowl.