 Louis Philippe served under his father's crony, Armand Louis de Gontaut the Duke of Biron, along with several officers who later gained distinction afterwards.These included Colonel Berthier and Lieutenant Colonel Alexandre de Beauharnais (husband of the future Empress Joséphine).After war was declared by the Kingdom of France on the Habsburg Monarchy on 20 April 1792, Louis Philippe saw his first exchanges of fire of the French Revolutionary Wars within the invaded by France Austrian Netherlands at Boussu, Walloon, on about 28 April 1792, and then at Quaregnon, Walloon, on about 29 April 1792, and then at Quiévrain, Walloon, near Jemappes, Walloon, on about 30 April 1792, where he was instrumental in rallying a unit of retreating soldiers after the victorious Battle of Quiévrain (1792) only two days earlier on 28 April 1792.