“There are two ways of recruiting the British army”, wrote Campbell Dalrymple in his 1761 military manual,

In times of war, the fiscal-military state's appetite for soldiers proved voracious. The strength of the British Army in the Seven Years War swelled from roughly 31,000 men to 117,000 (on paper or 93,000 in effective strength) from 1755 to 1762, with the army in America accounting for 30,000 of these troops at its peak strength. This did not include the numerous provincial troops of the colonies, which numbered from nearly 10,000 to in excess of 20,000 men in any given year during the war. The combined figure of 40,000 to 50,000 should be doubled to arrive at total combatants when considering losses due to battlefield casualties, victims of disease or accident, desertion, and the end of service terms. These numbers were no small matter for any society, especially considering that the overwhelming majority of recruits came from Britain.

The British Army of the eighteenth century had become a modern volunteer force, with a number of qualifications. Impressment (i.e., conscription) was the most significant departure, although it only ever generated a distinct minority of soldiers. Britain also relied on mercenary forces hired from independent German polities, largely to fight for its interests on the continent, but also in the American Revolution across the Atlantic. The army arrived at this particular configuration as the result of a number of long-term historical processes, the first being political in nature. Throughout the seventeenth century, England engaged in ongoing internal conflict and regime change – civil war, regicide, creation of the Commonwealth, restoration of the monarchy, and revolution – that occupied it at home.