Field Marshal Albrecht von Kesselring, left, General Paul von Lettow-Vorbeck, commander of the German troups in Africa during World War I and Mrs. Lucie (Lucia Maria) Rommel, wife of late General Rommel, known as the "Desert Fox" in World War II in Dusseldorf, Germany, September 29, 1956. In a big reunion tonight, members of the former German Africa Korps, the British Eighth Army, and the Italian Ariette Division met here for their annual celebration. The way the veteran soldiers, once deadly enemies, behaved suggested it was an old sporting event rather than a life or death campaign they were commemorating. The special event of the night was the personal appearance of the original Lili Marlen, Lale Andersen, now 45, who sent the old hit of the western desert throbbing through the vast hall, while Germans, Italians and British linked arms and sedately rocked together, joining in a mass rendering of the choruses so well remembered