The aim of this big-scale operation was to pierce the front to the west and release Brittany. On July 25th the operation started by a bombing between La-Chapelle-Enjuger and Hébécrevon at the north-west of Saint-Lô. The next part of the operation allowed opening the way to the Allied tanks to the South and the West. Germans were not able to defend their positions. On July 30th, General Wood released Avranches and continued its road in direction of Brittany. The assessment of the operation was positive because in no less than a week American troops advanced from 60 km in the front.