 Complete the following phrase:  Before talks could begin, Coalition armies crossed the Rhine on 22 December. Metternich retired from Frankfurt to Breisgau to celebrate Christmas with his wifes family before travelling to the new Coalition headquarters at Basel in January 1814. Quarrels with Tsar Alexander, particularly over the fate of France intensified in January, prompting Alexander to storm out. He therefore missed the arrival of Castlereagh in mid-January. Metternich and Castlereagh formed a good working relationship and then met with Alexander at Langres. The Tsar remained unaccommodating however, demanding a push into the centre of France; but he was too preoccupied to object to Metternichs other ideas, like a final peace conference in Vienna. Metternich did not attend talks with the French at Chatillon, as he wanted to stay with Alexander. The talks stalled, and, after a brief advance, Coalition forces had to retreat after the 