After the nearly concurrent breakthroughs at Cassino and Anzio in spring 1944, the 11 nations representing the Allies in Italy finally had a chance to trap the Germans in a pincer movement and to realize some of the British Prime Minister Winston Churchill's strategic goals for the long, costly campaign against the Axis "underbelly". This would have required the U.S. Fifth Army under Lieutenant General Mark W. Clark to commit most of his Anzio forces to the drive east from Cisterna, and to execute the envelopment envisioned in the original planning for the Anzio landing (i.e., flank the German 10th Army, and sever its northbound line of retreat from Cassino). Instead, fearing that the British Eighth Army, under Lieutenant-General Sir Oliver Leese, might beat him to the Italian capital of Rome, Clark diverted a large part of his Anzio force in that direction in an attempt to ensure that he and the Fifth Army would have the honour of liberating the city.