Mezue nkebi ahịrịokwu na-esonụ: Ọrụ ọzọ Lockhart nwetara bụ n'ebe a na-eji égbè agbagbu ndị agha n'April 1747. "Devonshire" bụ ọkọlọtọ nke Rear-Admiral Peter Warren, onye Lockhart hụrụ ọrụ na
Agha nke mbụ nke Cape Finisterre na 3 Mee 1747. Mgbe ahụ, a họpụtara ya ka ọ bụrụ onye isi mbụ ya, nke ọkụ ọkụ, nke ọ hụrụ na ya na ndị agha Sir Edward Hawke na Agha nke Abụọ nke Cape Finisterre na 16 Ọktọba 1747. Otu n'ime ndị ọchịagha n'agha ahụ, Thomas Fox nke egbe 64, mechara wepụ ya n'ọchịchị ya mgbe esemokwu gbasara omume ya na ọgụ ahụ, e nyekwara Lockhart iwu nwa oge nke "Kent" n'ọnọdụ ya. N'afọ 1748 Lockhart bụ onye isi ndị nche nke Portsmouth, na afọ ole na ole sochirinụ bụ ọkara ụgwọ na Scotland. N'ọnwa Jenụwarị 1755 a họpụtara ya ka ọ bụrụ onye isi nke 90 egbe na Captain Charles Saunders, na 22 Eprel 1755 a kwalitere ya ka ọ bụrụ onye isi nke 8-gun sloop, nke a na-etinye n'afọ ahụ na ndị agha ọdịda anyanwụ na-aga n'okpuru iwu nke Sir Edward Hawke ma ọ bụ Vice-Admiral John Byng.