Correction "Worrumbi" is not a clan name. It is the name for the largest shields used in the Mendi valley. Here is an extract about contact in the Mendi valley 1954. Taken from the link which is extremely informative but very long. Hence the extract.
INTRODUCTORY VOTE:-
The following; "thesis is based on field-work carried
out in three periods: June to December, 1954; July, 1955
to. October, 1956; and July to -becember, 1958. The first
two visits were assisted by research grants from the University
of Sydney, and the third was financed by the W.M.
Strong Fellowship, which I held for 1957 and 1958.
Field-work-in this area presented certain difficulties.
When I arrived in Mendi in 1954, the government - station (the
first in the Southern Highlands District) had benn open for
only four years, and the whole . District was a "restricted,-
area". The natives were still hostile, and while. I was
there, government patrols were ,attacked twice, whin six'
miles of the station. Travelling without an armed escort
was presumed dangerous for Europeans, and our movements
were severely restricted. I myself was given more latitude
than were most Europeans who were not Native Affairs Officers, , but, until my, hird visit in 1958, I was not allowed more
than 10 miles north of Mendi station, nor could I enter the
neighbouring Lai Valley.
http://library.ucsd.edu/dc/object/bb21855464/_1.pdf