Italy joined the Germans in the Battle of France, fighting the fortified Alpine Line at the border. Just eleven days later, France and Germany signed an armistice. Included in Italian-controlled France were most of Nice and other southeastern counties. Mussolini planned to concentrate Italian forces on a major offensive against the British Empire in Africa and the Middle East, known as the "parallel war", while expecting the collapse of the UK in the European theatre. The Italians invaded Egypt, bombed Mandatory Palestine, and attacked the British in their Sudan, Kenya and British Somaliland colonies (in what would become known as the East African Campaign); British Somaliland was conquered and became part of Italian East Africa on 3 August 1940, and there were Italian advances in the Sudan and Kenya with initial success. The British government refused to accept proposals for a peace that would involve accepting Axis victories in Europe; plans for an invasion of the UK did not proceed and the war continued.