did the british fail to invade benin?

Yes, the British failed to invade Benin (now known as Nigeria) in 1897. The British expedition was launched against the Oba (ruling king) of Benin, who was accused of human sacrifice and other human rights abuses. The famous 1897 Benin expedition led to a one-sided battle in which British troops effectively defeated the local forces. The Oba of Benin was exiled, and much of his property was looted and shipped back to Britain.