The Middle Eastern theatre was quiet for the first few months of the war until Italy's declaration of war in June 1940. The Italian forces in North and East Africa greatly outnumbered the British and Wavell's policy was therefore one of "flexible containment" to buy time to build up adequate forces to take the offensive. Having fallen back in front of Italian advances from Libya, Eritrea and Ethiopia, Wavell mounted successful offensives into Libya (Operation Compass) in December 1940 and Eritrea and Ethiopia in January 1941. By February 1941, his Western Desert Force under Lieutenant General Richard O'Connor had defeated the Italian Tenth Army at Beda Fomm taking 130,000 prisoners and appeared to be on the verge of overrunning the last Italian forces in Libya, which would have ended all direct Axis control in North Africa. His troops in East Africa also had the Italians under pressure and at the end of March his forces in Eritrea under William Platt won the decisive battle of the campaign at Keren which led to the occupation of the Italian colonies in Ethiopia and Somaliland.