Official and elite unease over carnival revelry (which was considered violent and unruly) grew during the next few decades, and in 1883 drumming was banned in an attempt to clean up Carnival. This injunction came after a serious disturbance during the 1881 Carnival, known as the Canboulay Riots. Canboulays were processions during carnival that commemorated the harvesting of burnt cane fields during slavery, a process so labor-intensive that it had often involved forced marches of slaves from neighboring plantations to more efficiently harvest the cane (once the field is burned, the cane requires immediate harvesting, or it spoils). These canboulay processions were popular, and often incorporated kalenda. The government's attempt to ban the processions in 1881 resulted in open riots between Afro-Creole revelers and police, a turn of events that, not surprisingly, caused deep resentment within Trinidadian society toward the government's use of power. The open resistance of Afro-Creole revelers, of course, redoubled concerns among government officials over this potential threat to public order and led to an alternative strategy—the banning of drumming—in 1883. To make sure that the point got across, stick-fighting itself was banned in 1884. An ingenious substitute for the drums and sticks, called tamboo bamboo, was introduced in the 1890s.