The 1939–40 concert season saw Rachmaninoff perform fewer concerts than usual, totalling 43 appearances that were mostly in the US. The tour continued with dates across England, after which Rachmaninoff visited his daughter Tatyana in Paris followed by a return to Villa Senar. He was unable to perform for a while after slipping on the floor at the villa and injuring himself. He recovered enough to perform at the Lucerne International Music Festival on 11 August 1939. It was to be his final concert in Europe. He returned to Paris two days later, where Rachmaninoff, his wife, and two daughters were together for the last time before the composer left a now war-torn Europe on 23 August. Rachmaninoff would support Russia's war effort against Nazi Germany throughout the course of World War II, donating receipts from many of his concerts that season in benefit of the Red Army.