The alliance reached its high-water mark in late 1757, when a French invasion overran Hanover, Austrian troops recaptured Saxony, and Austria liberated its own province of Bohemia, which had been occupied by Prussia. Having signed a Second Treaty of Versailles in 1757, the French were now committed to an offensive war and sent troops to aid the Austrians against Prussia as well as financial subsidies to support the large armies put onto the field by Austria. By autumn 1757, the Franco-Austrian forces had appeared to be about to overwhelm the much-smaller Prussia, which would then be partitioned by their allies. However, two decisive Prussian victories at Rossbach and Leuthen ended tat offensive.