The ostrich industry recovered slowly, owing in part to the Second Anglo-Boer War of 1899 to 1902. Boer forces under Commandant Gideon Scheepers were sighted near Oudtshoorn on 25 August 1901, but moved on because the town was well defended. A second and bigger boom started after the war. It was during this period that "feather barons", ostrich farmers who had become rich, built most of Oudtshoorn's famously opulent "feather palaces", their houses, most of them on the west bank of the Grobbelaars River. The town grew even more, and in 1904 it claimed 8,849 residents in the census. This boom peaked in 1913, during which year the highest-quality feathers cost more than $32 a pound in 2012 prices. Ostrich feathers were outranked only by gold, diamonds and wool among South African exports before World War I. The market collapsed in 1914, according to "The Chicago Tribune", as a result of "the start of World War I, overproduction and the popularity of open-topped cars, which made ostrich-feather hats impractical." 80% of the ostrich farmers were bankrupted, and the ostriches were set loose or slaughtered for biltong. Domesticated ostriches numbered 314,000 at the end of World War I, but had plummeted to 32,000 by 1930. The Jewish population of Oudtshoorn fell from 1,073 in 1918 to 555 in 1936, and only continued to dwindle.