▁Swiss ▁campaign , ▁and ▁especially ▁at ▁the ▁Battle ▁of ▁Lin th ▁River , ▁fought ▁on ▁the ▁same ▁day ▁that ▁Mass é na ▁won ▁the ▁Second ▁Battle ▁of ▁Zur ich . ▁He ▁accompanied ▁Mass é na ▁to ▁Gen oa , ▁and ▁acted ▁as ▁his ▁principal ▁lieutenant ▁throughout ▁the ▁prot ract ed ▁sie ge ▁of ▁that ▁city , ▁during ▁which ▁he ▁operated ▁with ▁a ▁separate ▁force ▁outside ▁the ▁city ▁walls . ▁He ▁was ▁wounded ▁and ▁taken ▁prisoner ▁at ▁Monte ▁C retto ▁on ▁ 1 3 ▁April ▁ 1 8 0 0 . ▁ ▁Marsh al ▁of ▁the ▁Empire ▁The ▁victory ▁of ▁Mar engo ▁restored ▁his ▁freedom , ▁and ▁Sou lt ▁received ▁the ▁command ▁of ▁the ▁southern ▁part ▁of ▁the ▁kingdom ▁of ▁Nap les . ▁In ▁ 1 8 0 2 ▁he ▁was ▁appointed ▁one ▁of ▁the ▁four ▁gener als ▁command ing ▁the ▁cons ular ▁guard . ▁Though ▁he ▁was ▁one ▁of ▁those ▁gener als ▁who ▁had ▁served ▁under ▁More au , ▁and ▁who ▁therefore , ▁as ▁a ▁rule , ▁dis lik ed ▁Nap ol éon ▁Bon ap arte , ▁Sou lt ▁had ▁the ▁wisdom ▁to ▁show ▁his ▁dev otion ▁to ▁the ▁r uling ▁power . ▁In ▁consequence ▁he ▁was ▁appointed ▁ ▁in ▁August ▁ 1 8 0 3 ▁as ▁the ▁commander - in - ch ief ▁of ▁the ▁Camp ▁of ▁Bou log ne , ▁and ▁in ▁May ▁ 1 8 0 4 ▁he ▁was ▁made ▁one ▁of ▁the ▁first ▁mar sh als ▁of ▁the ▁Empire . ▁He ▁commanded ▁a ▁corps ▁in ▁the ▁advance ▁on ▁Ul