Britain and Rome is the answer
She can demand that witnesses testify.
The Louisiana Purchase made the United States twice the size it was before the purchase. They had to decide whether or not the states would be free or slave states, resulting in sectionalism.
The Mongol invasions of Japan failed because Typhoon winds destroyed the Mongol fleet. The Mongols failed to conquer Japan even though they had successfully conquered the much larger land of China and also Korea. The typhoons that saved Japan did not even happen just once but twice ! Both times that the Mongols set out to conquer Japan, their fleets were destroyed by typhoons. Japan was geographically in luck and also helped by nature.