To carry the aforementioned ultimatum to the defenders, Sakaguchi tasked Capt. Gerard Reinderhoff, former chief of staff to the Tarakan garrison commander, Lt.-Col. Simon de Waal and Capt.
Sakaguchi was tasked with conveying the ultimatum to the defenders; he delegated this responsibility to Capt. Gerard Reinderhoff, who had previously served as the chief of staff for the Tarakan garrison commander, Lt.-Col. Simon de Waal and Capt.