Kammala jumla mai zuwa: Bayan shigar Italiya cikin yaƙin a ranar 10 ga Yuni, 1940, Waller ya shiga cikin binciken filayen ma'adinai a gabar tekun Arewacin Afirka. Wani mai harbi mai kyau, shi da kansa ya busa ma'adanai masu iyo ta amfani da bindiga da harsasai masu huda makamai. A ranar 21 ga Yuni, "Stuart" ya harbe garin Bardia na Italiya. A watan da ya gabata, jirgin ruwa na 10 na Destroyer ya shiga cikin yakin Calabria. Jirgin ruwan Waller ya kai harin bam a kan Fort Capuzzo a ranar 17 ga watan Agusta da kuma wani jirgin saman jirgin saman Italiya a cikin Gulf of Bomba mako guda bayan haka. A watan Satumba, an ba shi lambar yabo ta Distinguished Service Order (DSO) don "ƙarfin hali, kamfani, da kuma sadaukar da kai ga aikin da aka yi kwanan nan" - musamman, gano wuraren da aka yi wa maƙiyi. A wannan watan, an canja shi zuwa HMAS "Vampire" yayin da "Stuart" ya shiga don gyarawa. Yayin da sojojin Allied suka fara kai hare-hare ga sojojin Italiya a watan Disamba na shekarar 1940, Babban Kwamandan Rundunar Ruwa na Rumunan, Admiral Sir Andrew Cunningham, ya ba Waller umurnin sabuwar rundunar Inshore Squadron, wacce ta kunshi masu hallaka, masu binciken ma'adanai, da masu taimakawa. A matsayinsa na Babban Jami'in Cunningham na Jirgin ruwa, Waller ya dauki nauyin goyon bayan jiragen ruwa don
kai hari kan Bardia, wanda ya fadi ga Allies a ranar 5 ga Janairu 1941. Ba da daɗewa ba bayan haka, ya ba da umurnin Inshore Squadron kuma ya koma jirgin "Stuart".