The mistrust between George and William was set aside during the revolution of 1688–89 but dogged relations during the latter's reign. George held mortgages on Femern, Tremsbüttel and Steinhorst, Schleswig-Holstein, which he surrendered to the Duke of Holstein as part of the peace of Altona of 1689 negotiated by William between Denmark and Sweden. William agreed to pay George interest and the capital in compensation, but George remained unpaid. During the military campaign against James's supporters in Ireland, George accompanied the Williamite troops at his own expense, but was excluded from command, and was even refused permission to travel in his brother-in-law's coach. Snubbed from the army by William, George sought to join the navy, without rank, but was again thwarted by his brother-in-law. When William's Dutch guards failed to salute George, Anne assumed they were acting under orders. George and Anne retired from court. Some degree of reconciliation was achieved following Queen Mary's sudden and unexpected death from smallpox in 1694, which made Anne heir apparent. In November 1699, William finally recommended that Parliament pay the mortgage debt to George, and in early 1700, the debt was honoured.