 In 1867, the Al Khalifa, along with the ruler of Abu Dhabi, sent a massive naval force to Al Wakrah in an effort to crush the Qatari rebels.This resulted in the maritime Qatari–Bahraini War of 1867–1868, in which Bahraini and Abu Dhabi forces sacked and looted Doha and Al Wakrah.The Bahraini hostilities were in violation of the Perpetual Truce of Peace and Friendship of 1861.