Ka cika wannan magana: A tsakanin shekara ta 1746 zuwa 1748, Pitt ya yi aiki tare da Newcastle wajen tsara dabarun yaƙi da na diflomasiyya na Britaniya. Ya raba tare da Newcastle wani imani cewa Birtaniya ya kamata ya ci gaba da yin yaki har sai ya iya samun salama mai kyau, sabanin wasu kamar Henry Pelham wanda ya fi son zaman lafiya nan da nan. Pitt da kansa ya yi baƙin ciki lokacin da abokinsa da ɗan'uwansa, Thomas Grenville, aka kashe a cikin jirgin ruwa
Yaƙin farko na Cape Finisterre a 1747. Duk da haka, wannan nasarar ta taimaka wajen tabbatar da mulkin Birtaniya na teku wanda ya ba Birtaniya damar yin shawarwari mafi karfi a lokacin da ya zo ga tattaunawar zaman lafiya wanda ya kawo karshen yakin. A Yarjejeniyar Aix-la-Chapelle a 1748 an musanya nasarar mulkin mallaka na Burtaniya don janyewar Faransa daga Brussels. Mutane da yawa sun ga wannan a matsayin yarjejeniyar tsagaita wuta kuma suna jiran sabon yaƙi.