Rubuta ci gaba don wannan sakin layi - An sake kafa wani kewaye a 1727 amma Mutanen Espanya sun kasa sake dawo da Gibraltar, kamar yadda Birtaniyya ta sake samun damar ƙarfafawa da kuma sake ba da garkuwar ta teku. Bayan kewaye, Mutanen Espanya sun fara gina Lines na Contravallation a 1730, wani tsari mai karfi a fadin fadin isthmus wanda aka kafa ta manyan manyan wurare guda biyu a kowane ƙarshen. Wannan an yi niyya ne don toshe hanyar daga Gibraltar zuwa babban yankin Spain, kuma don zama tushe ga duk wani kewaye na gaba. Muhimmancin yankin ya karu bayan da Birtaniya ta ci nasara a yakin Minorca a 1756, lokacin da nasarar da Faransa ta yi a cikin jirgin ruwa ya kai ga mika wuya ga sojojin Birtaniya
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