 Despite a stubborn rear guard, the 63rd Division of General Milburn's XXI Corps broke through the main belt of fortifications near St. Ingbert late on 19 March.Had events moved according to plan, Milburn then would have sent an armored column northward to link with Walker's XX Corps near St. Wendel; but so swift had been the advance of Walker's troops that all worthwhile objectives in Milburn's sector beyond the Siegfried Line already had fallen.Milburn and his XXI Corps had achieved a penetration but had no place to go.