young Chipewyan guides and reached the east end of Lake Athabasca. The six-week return trip was accomplished under difficult and sometimes hazardous conditions. The route surveyed, however, proved to be a

, Robertson commented on the influence Todd had exerted over the Chipewyans in his capacity as surgeon; his successful treatment of an outbreak of whooping cough gained a certain advantage for the HBC over the

houses lent to them by Patrick Small, a Canadian, who also provisioned them when they set out the following May. Turnor arrived at Fort Chipewyan (Alta), on Lake Athabasca, on 28 June 1791. From

Chipewyan. Violence reached a climax when Archibald Norman McLeod was in charge there; Clarke was twice arrested and Yale himself was seized in April 1817, taken to Great Slave Lake, and detained there until

) in the west to Fort Chipewyan in the north to Wabasca and Lesser Slave Lake in the south. When missionaries were on furlough, he substituted for them