On 8 May 1819 Schmaltz signed the Treaty of Ndiaw with the Brak of Waalo, which resulted in the creation of a series of commercial posts along the Sénégal River(Bakel, 1820 ; Dagana, 1821 ; Merinaghen, 1822 ; Lampsar, 1843 ; Sénoudébou, 1845).
The best agricultural land along the Senegal River is in the alluvial valley between Bakel and Dagana, and this area is the most densely populated part of the valley.
He was assigned to Senegal, where he was briefly commander of the Dagana circle (9 June - 12 July 1886), then Saldé (12 July 1886 - 16 February 1887) and then again Dagana (16 February 1887 - 1889)