I want to know the answer to the following question:
On what date did the French begin the re-crossing of the Danube?
All the background I'm provided with is that "From 30 June to the early days of July, the French recrossed the Danube in strength, with more than 180,000 troops marching across the Marchfeld towards the Austrians.". Is that enough to answer the question?
Answer: yes