The Bird Island Expedition was an expedition that took place before the Raid on the Eggs and before the Battle of Pig City. It was depicted in The Angry Birds Movie. The primary objective of the expedition was to retrieve the eggs from the birds, then bring them back to Piggy Island then eat them during dinner.
Prince Mudbeard's family, the Royal Family of Piggy Island, have been attempting to find eggs for generations. At an unknown point in the timeline, a naval vessel called The Porkchop Express had been made.