 On 14 June a successful surprise attack was made on Fort Capuzzo by the British, though it was not meant as a permanent gain as the British were using far more mobile tactics at the time.By mid-September, casualty listings indicate that Italy had lost 3,000 troops where the United Kingdom had only lost slightly over 490, despite Italy's land numbers and air superiority at the time.On 13 September 1940, Italy began a very slow advance eastward into Egypt.