The Oliviers returned to Britain in March 1943, and Leigh toured through North Africa that same year as part of a revue for the armed forces stationed in the region. She reportedly turned down a studio contract worth $5,000 a week in order to volunteer as part of the war effort. Leigh performed for troops before falling ill with a persistent cough and fevers. In 1944, she was diagnosed as having tuberculosis in her left lung and spent several weeks in hospital before appearing to have recovered. Leigh was filming "Caesar and Cleopatra" (1945) when she discovered she was pregnant, then had a miscarriage. Leigh temporarily fell into a deep depression that hit its low point, with her falling to the floor, sobbing in an hysterical fit. This was the first of many major bipolar disorder breakdowns. Olivier later came to recognise the symptoms of an impending episode—several days of hyperactivity followed by a period of depression and an explosive breakdown, after which Leigh would have no memory of the event, but would be acutely embarrassed and remorseful.