try to avoid bankruptcy by introducing immediate improvements, putting up rents, clearing tenants to allow higher-paying sheep farmers to be installed. Alternatively, the estate could be sold to wipe out the debts. A new owner was highly likely to have plans for improvement which would include clearance. They also had the money to fund assisted passages for cleared tenants to emigrate, so putting into practice ideas suggested in the 1820s and 1830s. As most purchasers were from outside the Highlands or from England, they neither understood nor followed the Gaelic principle of , so removing a potential level of protection for tenants. Finally, the landlord might enter bankruptcy, with the estate passing into the hands of administrators whose legal obligation was to protect the financial interests of the creditors. This last case was often the worst outcome for tenants, with any considerations of them having no relevance whatsoever under the law. Overpopulation The 18th century was a time of population growth, almost continuous from the 1770s onwards. This was not initially seen as a problem by landlords as people were considered to be an asset—both to provide a pool for military recruitment and as an economic resource. Landowners and the government sought to discourage emigration, an attitude that resulted in the Passenger Vessels Act 1803, which was intended to limit the ability of people to emigrate. The role of the Highlands in providing a source of recruitment for the army and navy was, in the words of T. M. Devine, "quite remarkable". Starting in the Seven Years' War (1756–63) and increasing during the American War of Independence, by the time of the Napoleonic Wars, one estimate put the Highland contribution to regiments of the line, militia, Fencibles and Volunteers at 74,000. This was out of a population of about 300,000. Even allowing for this estimate overstating the case, in time of war, the Highlands was seen as a significant recruiting resource. The attitude towards increasing population was altered in the first half of the 19th century. First, the kelp trade collapsed in the years immediately following the end of the Napoleonic Wars in 1815. Those working in the kelp trade were crofters, with not enough land to make a living, or cottars, the very poorest in society with the least access to land on which to grow food. Without alternative employment, which was not available, destitution was inevitable. The landlords