Whakaotihia te rerenga e whai ake nei: I muri tata mai i te pakarutanga o te Pakanga Tuarua o te Ao i te Mahuru o te tau 1939, ka tohua e Lieutenant General Sir Thomas Blamey a Vasey hei kaimahi mo te 6th Division. I te Poutu-te-rangi 1941, i riro i a Vasey te mana o te 19th Infantry Brigade, i arahina e ia i te Pakanga o Kariki me te Pakanga o Krete. I te hokinga ki Ahitereiria i te tau 1942, i whakatairangahia a Vasey ki te rangatira rangatira me te noho hei Kaiwhakahaere Tuarua mo te Kaimahi Matua. I te marama o Hepetema 1942, ka riro i a ia te mana o te Rōpū Tuarima, e whawhai ana ki nga Hapanihi i te
Ko te pakanga o Kokoda Track me te Pakanga o Buna-Gona. I te tau 1943, ka tiimata ia i tana pakanga tuarua ki New Guinea, e arahi ana i te 7th Division i te Tauranga i Nadzab me te pakanga a Finisterre Range i muri mai.