Rubuta ci gaba ga wannan sakin layi - Warren ya dauki umurnin a 1808 kuma ya yi aiki a cikin Baltic Sea, aiwatar da ayyukan da Rasha shipping. Daga nan sai ya yi umurni da jirgin ruwa, wanda aka tuhume shi da safarar Lucien Bonaparte da iyalinsa zuwa Ingila. Daga nan sai ya tashi zuwa Gabas ta Gabas kuma ya taka muhimmiyar rawa a mamaye Java
a shekara ta 1811. An sanya shi Abokin Bath a ƙarshen Yaƙe-yaƙe na Napoleon a 1815, kuma ya ba da umarnin ƙarin jiragen ruwa da yawa, gami da jirgin ruwan sarauta. Har ila yau, ya gudanar da wasu alƙawura na bakin teku, da aka yi wa knight kuma ya zama Knight Commander na Royal Guelphic Order a 1835. An gabatar da shi zuwa ga mai kula da shi a 1837, an sanya shi Knight Commander na Bath ba da daɗewa ba kafin mutuwarsa a 1839.