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Leboeuf took part in the Lorraine campaign, at first as chief of staff (major-general) of the Army of the Rhine, and afterwards, when Bazaine became commander-in-chief, as chief of the III Corps, which he led in the battles around Metz.
He was an instructor in the Royal Army Educational Corps with the British Army of the Rhine from 1952 to 1954, master at Westminster Abbey Choir School from 1954 to 1956, assistant organist at St Paul's Cathedral from 1956 to 1958, then an organist at Croydon Parish Church from 1958 to 1965.
After the replacement of Pichegru by General Jean Victor Marie Moreau, in June 1796 the Army of the Rhine and Moselle recrossed the Rhine at Strasbourg and defeated the Austrians at Renchen and at Rastadt.
He was affected to the Army of the Rhine on 26 frimaire an VIII (17 December 1799), where he distinguished himself at Fribourg and Biberach an der Riß.