Because of his knowledge of Switzerland, Grenville sent Wickham to that country in 1794 as assistant to the British ambassador. A year later he was named ''
chargé d'affaires'' when the ambassador took extended leave, and then appointed ambassador in his own right. His unofficial duties were to liaise with French opponents of the Revolution. By 1795, England was openly combating the French revolutionaries who had usurped and beheaded King
Louis XVI and Queen
Marie Antoinette. Wickham established a spy network in Switzerland, southern Germany and in France and negotiated with French Royalists and others, supporting amongst other initiatives the disastrous
rising in la Vendée. Wickham strengthened the British intelligence system by emphasising the centrality of the
intelligence cycle – query, collection, collation, analysis and dissemination – and the need for an all-source centre of intelligence. Even so, British intelligence would remain fragmented, partly because the threat of insurrection in Ireland (possibly with French support) remained a primary concern. This would remain the case until the creation of the
modern British intelligence system in the early 1900s. Nevertheless, the government secretly funded Wickham with a substantial budget for his activities, and he enjoyed considerable freedom with which to operate. A good deal of this was spent in a complex plot to bring French revolutionary general
Charles Pichegru over to the ranks of
Louis Joseph, Prince of Condé, who maintained an army on the Rhine. Wickham advanced £8,000 to feed and supply Pichegru's troops; however, Pichegru vacillated and the initiative failed. Wickham also reported on French troop positions, armaments and operations. French spies, however, learned of his network, and France pressured Swiss authorities to expel him. For a year and a half he was "the effective head of the
secret service". In that capacity, in March 1798 he orchestrated the arrests in London of leading radicals in the
London Corresponding Society and their
United Irish contacts, among them
James Coigly who was executed in June for treasonable communication with the French, and
Edward Despard destined to follow Coigly to the gallows in 1802. The following year, 1799, Wickham returned to Europe to
Swabia, close to the Swiss border, in 1799 where his averred role was to liaise with Austrian and Russian commanders engaged in campaigns against the French army. Again he negotiated inconclusively with Pichegru, but his expensive intrigues were rendered useless by the French victory at the
Battle of Marengo on 14 June 1800. Moreover, he was accused in London of misuse of public funds, which brought him close to a nervous breakdown. Wickham returned to London in 1801. Wickham advocated preventive policing: using networks of informers to uncover and frustrate seditious conspiracies before they reached fruition. However while he considered such undercover surveillance to be necessary in the national interest, he also believed that the security services should conduct in a manner appropriate to the circumstances. Thus, when peace appeared on the horizon in 1801 he proposed winding back of the wartime intelligence apparatus to a level "which a Free People jealous of its Liberties may be supposed fairly and rightly to entertain." ==Ireland==