Blakeney transferred to the 17th Regiment of Foot on 10 March 1798 and saw action at the Battle of Krabbendam and the Battle of Bergen both in September 1799 and the Battle of Alkmaar and the Battle of Castricum both in October 1799 during the Anglo-Russian invasion of Holland. Promoted to major on 17 September 1801, he transferred to the 47th Regiment of Foot on 11 July 1803. After transferring again, this time to the 7th Regiment of Foot on 7 April 1804, he joined the expedition to Denmark led by Lord Cathcart, took part in the Battle of Copenhagen in August 1807 and, having been promoted to lieutenant colonel on 7 May 1808, also took part in the capture of Martinique in February 1809. He undertook garrison duty in Nova Scotia later that year.