[3][9][10] After the rebellion broke out, Becking was sent to Bantam Residency in November 1926 with a company of Menadonese soldiers and helped put down the unrest in that area.

[15] During his time in charge of the camp, Becking occasionally tried to lead KNIL soldiers in punitive raids against the local Papuan population, who generally managed to escape into the jungle before they arrived.

[17] As more waves of exiles continued to arrive throughout 1927, Becking came to resent the position of the colonial government which forbade him from enforcing strict discipline, forced labour and punishment on the prisoners and reprimanded him when he tried to.

[21] Although he admitted he had to watch his words as a still-serving KNIL officer, he suggested that the site had not been well chosen because it could not support the health or agricultural needs of the residents.

[3][26][27] After retiring from the military, Becking continued to support himself by giving lectures about Digoel, the rise of Japan, and other topics, primarily to the Vaderlandsche Club.

[31][32] With the funding of German interests, he also led some gold prospecting expeditions and developments in New Guinea starting in 1937, including one that worked for two years near Tanahmerah and which brought a lot more ships and airplanes to that remote area.

[3][39] These prisoners were initially detained on Onrust Island, Ngawi, and other sites in East Java; none faced trial or were charged with any crimes.

[41] Becking was identified as one of the "irreconcilable" political figures who would have to be exiled; Louis Johan Alexander Schoonheyt, the former Digoel doctor and an active NSB member, and Ernest Douwes Dekker, and Indonesian nationalist, were among them.

[41][39] When they arrived in Jodensavanne, internees were immediately put to work in hard labour in a "green hell", denied medication for dysentery, and subjected to degrading hazing tactics, despite not having been charged with any crime.

[45] They were regularly beaten with clubs or had their hands and feet shackled together; two went on hunger strike and died as a result, while others were tortured and killed by guards after an escape attempt.