As the Soviet Union recovered from the initial shock and slowed down the Axis offensive at the Battle of Moscow (October 1941 – January 1942), Romania was asked by its allies to contribute a larger number of troops. A decisive factor in Antonescu's compliance with the request appears to have been a special visit to Bucharest by Wehrmacht chief of staff Wilhelm Keitel, who introduced the "Conducător" to Hitler's plan for attacking the Caucasus ("see Battle of the Caucasus"). The Romanian force engaged in the war reportedly exceeded German demands. It came to around 500,000 troops and thirty actively involved divisions. As a sign of his satisfaction, Hitler presented his Romanian counterpart with a luxury car. On 7 December 1941, after reflecting on the possibility for Romania, Hungary and Finland to change their stance, the British government responded to repeated Soviet requests and declared war on all three countries. Following Japan's attack on Pearl Harbor and in compliance with its Axis commitment, Romania declared war on the United States within five days. These developments contrasted with Antonescu's own statement of 7 December: "I am an ally of the [German] Reich against [the Soviet Union], I am neutral in the conflict between Great Britain and Germany. I am for America against the Japanese."