sentences:  In 1799 Dundas put Thibault in charge of repairs to military buildings as an architect.When Sir George Yonge, 5th Bt (1731–1812) replaced Dundas as Governor, he appointed Thibault as architect of military works under his aide-de-camp.Cape under Dutch rule 1803–1806 As he had sworn allegiance to England, Thibault went through a period of disfavour when the Cape was returned to the Dutch.