The loss of so many young men during the Second World War made it difficult for clubs to retain their former status. This was especially true for Millwall, who appeared to suffer more than most. From being one of the country's biggest clubs before the war, Millwall were reduced to one of its smallest afterward. The Den sustained severe bomb damage on 19 April 1943, and one week later a fire, determined to have been caused by a discarded cigarette, also destroyed an entire stand. The club accepted offers from neighbours Charlton Athletic, Crystal Palace and West Ham United to stage games at their grounds. On 24 February 1944, Millwall returned to The Den, to play in an all-standing stadium. This was achieved with considerable volunteer labour by Lions fans.