 Complete the following phrase:  From November 1853, engineer Sylvestre du Perron directed work on Souverain to add a 600-shp steam engine, after plans by Dupuy de Lôme, without lengthening the ship; Souverain started her new trials in June 1857, under Commander de Jouslard. In her new configuration, she still carried 110 guns. In 1862, she was reconfigured as a troopship for the 