Rubuta ci gaba ga wannan sakin layi - An ba da rahoton cewa ya kasance Kyaftin a cikin sojojin Earl na Leicester, yana yaƙi da kwamiti daga Elizabeth I, kuma a ƙarƙashin tutar Henry na Navarre. An yi tunanin cewa ya mutu a yakin Ivry
, Faransa a shekara ta 1590. Duk da haka, Reverend Cotton Mather na Boston ya rubuta: "Mahaifin Thomas Dudley shi ne Kyaftin Roger Dudley, - an kashe shi a yaƙe-yaƙe, lokacin da - ɗansa, da 'yarta ɗaya kaɗai suna ƙanana". Nufin Thomas Dorne (Thorne) na Yardley Hastings, Gent., wanda aka rubuta a ranar 29 ga Oktoba, 1588, ya ba da "ga 'ya'yan Susan Dudley, 'yata, gwauruwa, £ 10 da za a raba daidai". (S1, S11). Saboda haka, Roger ya mutu a lokacin da surukin mahaifinsa ya yi, wanda, wanda aka rubuta a 1588, ya kawar da yakin Ivry a matsayin yiwuwar ranar mutuwarsa. Wataƙila ya mutu a Siege of Zutphen a 1586, bayan ya bi ɗan'uwansa, Robert Dudley, 1st Earl na Leicester, wanda shine babban mutum a wannan yaƙin, wanda kuma ya ɗauki ran ɗan'uwan ɗan'uwan Leicester Sir Philip Sidney.