I want to know the answer to the following question:
Which army was forced to retreat to Metz and surrender two months later?
All the background I'm provided with is that "The next morning, the French Army of the Rhine, rather than resume the battle with an attack of its own against the battle-weary German armies, retreated to Metz where they were besieged and forced to surrender two months later.". Is that enough to answer the question?
Answer: yes