This was followed in November by a convention between Britain and Russia; in February 1748, a Russian corps of 37,000 arrived in the Rhineland. Although the Dutch city of Maastricht surrendered to French forces in May 1748, ending the war was increasingly urgent. Louis XV therefore agreed to return the Austrian Netherlands, whose acquisition had cost so much. Few of his countrymen understood this decision; combined with the lack of tangible benefits for helping Prussia, it led to the phrase "as stupid as the Peace".