Mezue ahịrịokwu na-esonụ: Mgbe Agha Ụwa nke Abụọ malitere na Septemba 1939, Bols gafere ọtụtụ ọkwa ndị isi ndị ọrụ, na-eje ozi n'ọtụtụ ụlọ ọrụ na ndị agha ndị agha tupu e bulie ya n'ọkwa kọlụm ma na-elekọta ọzụzụ niile maka ndị agha n'okpuru iwu nke 21st Army Group ma na-enyere aka ịhazi Operation Overlord, Allied invasion of Normandy. Bols mechara bulie ya elu ọzọ ma nye ya iwu na ndị agha nke 185th Infantry Brigade n'oge Allied
ọ ga-aga n'ihu na Western Europe, tupu o weghara ọchịchị nke 6th Airborne Division site n'aka Major General Richard Gale na ngwụcha 1944. Ọ duru ndị nkewa na Agha nke Bulge, yana Operation Varsity, ọrụ ikuku iji gafee Osimiri Rhine, wee duru ndị nkewa na northern Germany ruo na njedebe nke esemokwu ahụ. Ndị agha Canada ji parachute weghaara obodo Wismar n'ụbọchị ikpeazụ nke agha ahụ, iji gbochie ndị agha Soviet ịwakpo Denmark. Bols bụ onye isi ndị agha ahụ zutere ndị Soviet ihu na ihu na Wismar, na-ekwusi ike na njide nke obodo ahụ e weghaara, na-emegide nkwekọrịta ogbako Yalta. O mere ka ndị Soviet kwụsị ọrụ ha ruo nwa oge. Ka ọ dịgodị, Lübeck na Hamburg nwere ike ịrara onwe ha nye ndị agha jikọrọ aka, n'ikpeazụ ndị agha jikọrọ aka n'okpuru ndị isi nke onye isi ndị agha Montgomery tọhapụrụ Denmark. Mgbe agha biri, Bols nọgidere na-achị ngalaba ahụ na ọrụ udo na Middle East, wee laa ezumike nká na 1948 dị ka onye isi ndị isi.