The
Batavia Mutiny is well documented. The first account was published in 1647 in
Ongeluckige Voyagie, and a detailed and complete translation of Commandeur
Francisco Pelsaert's journal was published by
Henrietta Drake-Brockman in
Voyage to Disaster in 1963. Loos was aged 24 when the Batavia Mutiny took place. In the course of the mutiny he was accused of being involved in a particularly gruesome and notorious incident in which all the Predikant (minister) Gijsbert Bastiaenszoon's family, apart from his eldest daughter Judith, were massacred in their tent. He was also reported to have bashed in the head of Mayken Cardoes while another mutineer was trying to cut her throat. There was a dramatic change in Loos's role, however, on 2 September 1629. Corneliszoon had been inept in his tactics in the conflict that had arisen between the mutineers and another group, the defenders, who had been holding out against them. On the pretext of negotiating, Corneliszoon, accompanied by Loos and four other henchmen, had arranged to meet with the defenders. However, the defenders sprang a trap and tried to take Corneliszoon and his henchmen prisoner. Other mutineers nearby immediately prepared to attack, so the defenders killed all their prisoners on the spot, apart from Corneliszoon, and Loos, who managed to escape. As an anonymous defender described it, "by a ruse we took five of the principal murderers prisoner. Seeing this, the others resorted to their weapons. When we saw this, that our enemies wanted to come upon us, we struck four of them dead." This was done to "avoid being hampered by the prisoners". Consequently, Lance-Corporal Cornelis Pieterszoon, Cadets Conraat van Huyssens and Gysbrecht van Welderen, and Assistant Davidt Zevanck were killed on the spot. With their leader Corneliszoon captured and four of their number killed, the mutineers retired in confusion. ==Loos elected leader of the mutineers==