The summit was first reached in 1913 during the Third South New Guinea Expedition, which lasted from September 1912 to April 1913 and followed the same route. It was led by Alphons Franssen Herderschee, an officer of the Royal Netherlands East Indies Army, and its aim was to research the soils, flora and fauna of the region that lay above 2,300 metres. Other expedition members were the zoologist Gerard Martinus Versteeg, the botanist August Adriaan Pulle, the geologist Paul François Hubrecht, and J.B. Sitanala, an Indonesian GP. Herderschee also took over the role of ethnographer. Including soldiers, porters and dayaks, the baggage train had 241 members. They were divided up into several groups in order to carry out the different tasks in a time-effective way. Herderschee, Hubrecht and Versteeg formed the summit team, which reached the "Wilhelminatop" on 21 February 1913.