Mezue ahịrịokwu na-esonụ: Ọtụtụ enyi na ndị na-abụghị asọmpi derbies weere ọnọdụ n'oge Agha Ụwa Mbụ na nke Abụọ. Na ngụkọta, e mere egwuregwu iri atọ na atọ n'etiti ndị otu na Wartime Leagues. Ha abụọ gbara egwuregwu nke ndị na-eto eto, ndị na-echekwa na ndị na-abụghị ndị ọkachamara, na-egwu egwuregwu 14 na London Combination n'etiti 1915 na 1919. West Ham meriri itoolu, Millwall meriri atọ na abụọ dara. Mgbe Agha Worldwa nke Mbụ gasịrị, Football Association weghachiri Njikọ Football na England na West Ham sonyeere Second Division maka oge 1919-20. Millwall sonyeere ngalaba nke atọ na mbido 1920/21 oge, na mgbasawanye nke Njikọ bọọlụ bọọlụ site na klọb 44 ruo 66. N'afọ 1926, otu
ndị ọrụ gburugburu Royal Docks, ọtụtụ n'ime ha bụ ndị na-akwado West Ham. Akụkọ na-enweghị isi na-ekwu na ndị ọrụ na-arụ ụgbọ mmiri na-akwado Millwall nke Isle of Dogs jụrụ inye nkwado ha, na-akpali iwe. N'oge a, Millwall esilarị na Isle of Dogs pụọ ma na-egwu egwu na New Cross ruo afọ iri na isii.