 The charts Walker accumulated were notably short in details on the area around the mouth of the Saint Lawrence, as was the journal Sir William Phips kept of his 1690 expedition to Quebec, which Walker also acquired.Walker interviewed some participants in the Phips expedition, whose vague tales did nothing to relieve his concerns about what he could expect on the river.These concerns prompted him to detach his largest and heaviest ships for cruising duty, and he transferred his flag to the 70-gun "Edgar".