With the U.S. VI and VII Corps, de Lattre and his commanders, mainly generals Antoine Béthouart, Edgard de Larminat (replaced on 31 August 1944 by Joseph de Goislard de Monsabert) disembarked in Provence on 15 August 1944 and took part with the French Forces of the Interior in the battles of Toulon on 27 August and Marseille on 29 August. The liberation of these two sea ports greatly increased Allied capacity to land men and munitions, gaining them a decisive advantage on the Western Front.