During World War II he was appointed Commissioner of the German army in the office of the Reich Protector of Bohemia and Moravia.

On 26 July 1944, he was replaced in this position by SS-Obergruppenführer Karl Wolff and Toussaint became commissioner of the German army in the office of the Reich Protector of Bohemia and Moravia, replacing Ferdinand Schaal and, simultaneously, held the position of Commander of the Military District of Bohemia and Moravia.

After World War II, he was captured by US troops in Pilsen and, on 19 April 1947, he was transferred into Czechoslovakia, where on 26 October 1948 he was condemned to life imprisonment for the murder of civilians in the Prague uprising.

[4] In 1955, he agreed to collaborate with Czechoslovak State Security,[5] but the Central Committee of the Communist Party of Czechoslovakia refused to consent to his release from prison.

While still in prison, he provided them information relating to the West German military leaders and political figures.