Tuhia he haere tonu mō tēnei wāhanga - I whakahaeretia a Roberts ki ngā ope whenua mō te whakaekenga ki Dieppe
, i te 19 o Akuhata, 1942. I runga i te kaipuke tōna wāhi whakahau, ā, nā te kino o ngā whakawhitiwhitinga kōrero, kāore i mōhio ia ki te āhua o te whakahaere a ōna hōia, tae noa ki te wā i karangahia ai e rātau he waka whakaekenga mō te nekehanga wawe. I whakahe a Roberts mo te kore e tika te tuku i ana hoia rahui (Les Fusiliers Mont-Royal) me te whakanui i nga patunga. I whakakorehia ia i tana whakahau i nga marama e ono i muri mai. Ko te mahinga kino a Roberts i te wa o te pakanga-kino i tapaina ko Operation Spartan i te Maehe 1943, kaua ko te Dieppe, i mutu ai te mahi a Roberts. I whakahe a General Harry Crerar ki a Roberts mo te pai o te mahi tahi i waenga i nga pu o te 2nd Division me nga hoia hiko i te wa o nga mahi pakanga a Spartan, a kaore a Roberts i kaha ki te keri i muri i te hopu i tetahi piriti ahakoa he nui te waa ki te mahi pera. Whai muri i te Operation Spartan, i whakawakia a Roberts kia kore e pai ki te pupuri i te whakahau whawhai. I tukuna ia ki te whakahau i nga waahanga whakapakari i te United Kingdom a kaore i whiwhi i etahi atu whakahau whakahaere. I muri mai ka reti ia ki nga Moutere Channel i mate ai ia i te tau 1962.