For five months Bismarck did nothing. However, in November the Danish government instituted a new constitution whereby Schleswig was bound closer to Denmark. By the year's end, the Prussian and Austrian armies had occupied Holstein and were massing on the River Eider, the border with Schleswig. On 1 February 1864 the Prussian-Austrian armies invaded Schleswig, and ten days afterwards the Danish government requested British help to resist this. Russell urged Palmerston to send a fleet to Copenhagen and persuade Napoleon III that he should mobilise his French soldiers on the borders of Prussia.