The expedition of Thompson was unfortunate in the extreme, but the accounts received of his adventures and death, have been differently recited.

It is certain, that Thompson ascended the Gambia as far as Tenda, a point much beyond what any European had before reached, and according to one account, he was here attacked by the Portuguese, who succeeded in making a general massacre of the English.

Another account states, that he was killed in an affray with his own people, and thence has been styled the first martyr, or more properly the first victim in the cause of African discovery.
The company, however, nothing daunted by the ill success of Thompson, despatched another expedition on a larger scale, consisting of the Sion of 200 tons, and the St.John of 50, giving the command to Richard Jobson, to whom we are indebted for the first satisfactory account of the great river districts of western Africa.
Jobson arrived in the Gambia, in November, 1620, and left his ship at Cassau, a town situate on the banks of that river.

Here, however, his progress was impeded by the machinations of the Portuguese, and so great was the dread of the few persons belonging to that nation, who remained at Cassan after the massacre of Thompson, that scarcely one could be found, who would take upon himself the office of a pilot to conduct his vessel higher up the river.

In this extremity he had no other resource than to take to his boats, but, on ascending the river, he found his merchandise in comparatively little request, and repented that he had not laden his boats with salt.