Read other sources on the history of the sack of Benin. This article romanticizes a city with human sacrifices and slave trade.

From Wikipedia's article on the Benin Massacre:

But the way Benin treated its slaves and the public display of large quantities of human remains hardened British attitudes towards Benin's rulers. The trader James Pinnock wrote that he saw 'a large number of men all handcuffed and chained' there, with 'their ears cut off with a razor'. T.B Auchterlonie described the approach to the capital through an avenue of trees hung with decomposing human remains. After the 'lane of horrors' came a grass common 'thickly stewn with the skulls and bones of sacrificed human beings.'