Rubuta ci gaba don wannan sakin layi - Lokacin da Yaƙin Duniya na II ya fara a watan Satumba na 1939, Bols ya motsa ta hanyar matsayi na jami'in ma'aikata da yawa, yana aiki a cibiyoyi da yawa da kuma rundunonin Sojoji kafin a ba shi mukamin Kanar kuma ya kula da duk horar da sojoji a karkashin umurnin Armyungiyar Sojoji ta 21 da kuma taimakawa wajen tsara Operation Overlord, mamayewar Allied na Normandy. Bols an sake inganta shi kuma ya umurci Brigade na 185th Infantry a lokacin da Allied ya ci gaba ta Yammacin Turai
, kafin ya karbi umurnin na 6th Airborne Division daga Major Janar Richard Gale a karshen 1944. Ya jagoranci sashen a yakin Bulge, da kuma Operation Varsity, aikin da aka yi a cikin iska don tsallake kogin Rhine, sannan ya jagoranci sashen zuwa arewacin Jamus har zuwa karshen rikici. Sojojin Kanada sun kama garin Wismar a kwanakin karshe na yakin, don dakatar da sojojin Soviet daga mamaye Denmark. Bols shi ne jami'in da ya sadu da fuska da fuska tare da Soviets a Wismar, yana dagewa kan haɗin gwiwar da aka kama a birnin, akasin yarjejeniyar taron Yalta. Ya dakatar da Soviet na ɗan lokaci. A halin yanzu, Lübeck da Hamburg za su iya mika wuya ga sojojin da ke kawance, kuma a karshe Denmark ta 'yantar da' yan uwan da ke karkashin jagorancin Marshal Montgomery. Bayan karshen yakin Bols ya kasance a matsayin kwamandan rundunar a ayyukan kiyaye zaman lafiya a Gabas ta Tsakiya, sannan ya yi ritaya a shekarar 1948 a matsayin babban janar.