▁Island ▁the ▁following ▁year , ▁and ▁soon ▁afterwards ▁Const able ▁Mc Coll ▁was ▁spe ared ▁on ▁that ▁island . ▁Only ▁the ▁inter vention ▁of ▁mission aries , ▁who ▁had ▁a ▁fo oth old ▁on ▁the ▁fr ing es ▁of ▁this ▁area , ▁and ▁of ▁the ▁anth rop ologist ▁Donald ▁Thom son , ▁a vert ed ▁an ▁official ▁repr is al ▁designed ▁to ▁" te ach ▁the ▁wild ▁black s ▁a ▁less on ." ▁Several ▁Y ol ŋ u ▁were ▁imprison ed ▁in ▁F ann ie ▁Bay ▁Ga ol ▁in ▁present - day ▁Dar win . ▁However , ▁Thom son ▁was ▁able ▁to ▁help ▁to ▁have ▁them ▁released ▁by ▁going ▁to ▁live ▁with ▁the ▁Y ol ŋ u ▁and ▁as certain ing ▁the ▁facts ▁of ▁the ▁case . ▁ ▁Thom son ▁lived ▁with ▁the ▁Y ol ŋ u ▁for ▁several ▁years ▁and ▁made ▁some ▁phot ographic ▁and ▁written ▁records ▁of ▁their ▁way ▁of ▁life ▁at ▁that ▁time . ▁These ▁have ▁become ▁important ▁historical ▁documents ▁for ▁both ▁Y ol ŋ u ▁and ▁European ▁Austral ians . ▁ ▁In ▁ 1 9 3 5 ▁a ▁Method ist ▁mission ▁opened ▁at ▁Y ir r k ala . ▁ ▁In ▁ 1 9 4 1 , ▁during ▁World ▁War ▁II , ▁Thom son ▁persu aded ▁the ▁Australian ▁Army ▁to ▁establish ▁a ▁Special ▁Re con na issance ▁Unit ▁( N TS RU ) ▁of ▁Y ol ŋ u ▁men ▁to ▁help ▁rep el ▁Japanese ▁ra ids ▁on ▁Australia ' s ▁northern ▁coast line ▁( class ified ▁as ▁top ▁secret