(i) French hired Vietnam workers and paid for each rat that they caught.
(ii) Money was paid when tail of a rat was given as proof.
(iii) Some raised rats to earn money as tails were clipped and rats were released so that the process of earning continued.
(iv) For Vietnamese, rat hunt seemed to provide an early lesson in the success of collective bargaining.
(v) Those who did the dirty work of entering the sewers found that if they came together they could negotiate of a higher bounty.
