it was not until the 20th century that rich oil fields were discovered in the area. On 16 July 1909, after secret negotiation with the British consul, Percy Cox, assisted by Arnold Wilson, Sheik Khaz'al agreed to a rental agreement for the island including Abadan. In September 1980, Abadan was almost overrun during a surprise attack on Khuzestan by Iraq, marking the beginning of the Iran–Iraq War.