Nyorai kuenderera mberi kweiyi ndima - Nhamba dzinoverengeka dzerudo uye dzisina kukwikwidza derbies dzakaitika panguva yeHondo Yenyika Yekutanga neyeChipiri. Pamwe chete, mitambo 33 yakatambwa pakati pemapoka muWartime Leagues. Vose vari vaviri vakaisa zvikwata zvakaderera zvikuru zvevaduku, vashandi uye vasiri vashandi, vachitamba mitambo 14 muLondon Combination pakati pe1915 ne1919. West Ham yakakunda mapfumbamwe, Millwall nhatu uye mbiri dzakadhirowa. Mushure meHondo Yenyika Yekutanga, Football League yakaunzwazve muEngland neThe Football Association uye West Ham yakabatana neChipiri Chikamu chemwaka wa1919-20. Millwall yakabatana neChitatu Chikamu chekutanga mumwaka wa1920/21, mukuwedzera kweFootball League kubva kumakirabhu makumi mana nemana kusvika makumi matanhatu nematanhatu. Muna 1926 kuramwa basa kukuru
rakacherechedzwa nevashandi vaiva pedyo neRoyal Docks, vakawanda vavo vaiva vatsigiri veWest Ham. Nhau isina kururamiswa inotaura kuti vashandi vepachiteshi chengarava veIsle of Dogs vaitsigira Millwall vakaramba kupa tsigiro yavo, zvichikonzera hasha. Panguva ino, Millwall akanga atotama kubva kuIsle of Dogs uye akanga achitamba muNew Cross kwemakore 16.