In May 1904, Datu Ali ambushed seventeenth Infantry killing two officers and seventeen men. Despite of Woods condemnation of Moros, he knew that the anti-slavery law will proved the flashpoint. It arouse a great deal of opposition among the Moro Datus especially Datu Ali and his brother Datu Djimbangan who's making a good deal of money in slave trading. The so-called anti-slavery law ignited their general contempt for American Authority. General Leonard Wood also reported that all of the Datus except Datu Piang is united to resist the American rule for the operation of the slave law. In March 1905, a sizeable band of Datu Ali’s men was at the fort Siranaya (currently known as Sar-Raya) when U.S. troops attacked, killing many of the defenders and capturing Datu Djimbangan, leader and brother of Datu Ali and held as hostage forcing Datu Ali to surrender. Datu Ali refuse to yield and was encourage to continue the resistance by datus of Upper Cotabato ("Datu Ampatuan of Maganoy, Datu Mopuk of Dapitan, Datu Tambilawan of Libungan, Datu Manalintao of Madridagao, Datu Argao of Silag, and Datu Sansaluna"). The extant records of prosecutions for slavery in the Cotabato District are suggestive of the politically sensitive enforcement of the anti-slavery law. Notably, Datu Djimbangan was captured after the fall of Datu Ali kota in March 1905 by Captain Thomas W. Darrah, at his Rancheria by a detachment under command of Major C. M. Truit, 23rd infantry, hiding his ponderous hulk behind a coconut tree when discovered by Captain Darrah, who leaped across a small stream and sprang upon the astounded Moro. He was conducted as a prisoner to Cotabato and was transferred to the Zamboanga jail to await his trial for sedition and rebellion. Datu Djimbangan is sentence to five years in prison, his co-defendants to 3 years term, and the purchaser of the slave to a 2 years sentence.