Drake chose the Lisbon strategy based on Antonio and personal ambition

Evidence

After quitting Corunna he had opted for a voyage to Lisbon rather than Santander and San Sebastian, perhaps in response to the commercial interests of the expedition, but more probably in hopes of opening a front in Portugal – a strategy that rested more upon Dom Antonio’s glib tongue and Drake’s ardour to damage Spain than upon a cool assessment of the situation. — John Sugden, Sir Francis Drake, 1150

Categorization

• corroborated: 2 independent passages support this claim — John Sugden, Sir Francis Drake, 1150