On 28 March 2013 sub-contracted dockworkers at the Kwai Chung container terminal in Hong Kong walked out seeking a 17 per cent pay rise and recognition of their union, the Union of Hong Kong Dockers, an affiliate of the Hong Kong Confederation of Trade Unions. Between 500 and 700 workers occupied the terminal's main traffic routes and later moved their picket to the operator's parent company headquarters, and the dispute became one of the longest strikes in the city's history at 40 days. It ended on 6 May 2013 when the workers accepted a 9.8 per cent pay rise after four contractors gave written guarantees on pay and conditions.