In your original posting you asked about where the Grenadier Guards were in the middle part of the eighteenth century. They were involved in the War of Austrian Succession (1740 - 47), principally the
Battle of Fontenoy in 1745, during which the battalion lost 11 officers and 227 men killed or wounded. This battle marked the end the involvement of the Grenadier Guards in Europe during the War of Austrian Succession, and they returned to Britain in 1746. Their next major campaign came during the Seven Years War (1756-63). During this campaign the Guards were initially deployed in Northern Germany but then provided a company of soldiers to form part of the Brigade of Guards which was sent to North America as part of the British force to defend the British Colonies, and were involved in fighting in and around Philadelphia.
Throughout this period (1740-1765) the Grenadier Guards continued to provide guards for the Royal Household in London, so by no means all the men of the Regiment were involved in foreign wars.