Whakaotihia te rerenga e whai ake nei: Ko te taenga atu o Lockhart ki te 66-gun i te Paenga-whāwhā 1747. Ko te "Devonshire" te kaipuke rangatira o te Rear-Admiral Peter Warren, i kite a Lockhart i te mahi i te
Te Pakanga Tuatahi o Cape Finisterre i te 3 o Mei 1747. Kātahi ia ka whakawhiwhia ki tana whakahau tuatahi, ko te kaipuke ahi, i reira ia i kite ai i te mahi me te ope a Sir Edward Hawke i te Pakanga Tuarua o Cape Finisterre i te 16 o Oketopa 1747. Ko tetahi o nga rangatira i roto i te pakanga, ko Thomas Fox o te 64-gun, i muri mai i whakaorangia mai i tana whakahau i muri i te tautohetohe mo ana mahi i roto i te pakanga, a ka whakawhiwhia ki a Lockhart te whakahau mo te wa poto o "Kent" i tona waahi. I te tau 1748 ko Lockhart te rangatira tuatahi o te kaitiaki o Portsmouth, a, mo nga tau e whai ake nei, he haurua te utu i Scotland. I te marama o Hanuere 1755 i tohua ia hei rangatira tuatahi mo te 90-gun me te rangatira Charles Saunders, a i te 22 o Paenga-whawha 1755 i whakatairangahia ia hei rangatira mo te 8-gun sloop, i whakauruhia i te tau ki te kapa hauauru e rere ana i raro i te whakahau a Sir Edward Hawke, Vice-Admiral John Byng ranei.