When the policy had no effect, Wavell suggested negotiating with the Vichy governor Louis Nouailhetas, to use the port and railway. The suggestion was accepted by the British government but because of the concessions granted to the Vichy regime in Syria, proposals were made to invade the colony instead. In June, Nouailhetas was given an ultimatum, the blockade was tightened and the Italian garrison at Assab was defeated by an operation from Aden. For six months, Nouailhetas remained willing to grant concessions over the port and railway but would not tolerate Free French interference. In October the blockade was reviewed but the beginning of the war with Japan in December, led to all but two blockade ships being withdrawn. On 2 January 1942, the Vichy government offered the use of the port and railway, subject to the lifting of the blockade but the British refused and ended the blockade unilaterally in March.