Kingsley Garland Jayne and Edgar Prestage, 1911 Encyclopædia Britannica (1911)
“ Command of the sea could not be maintained—least of all in the monsoon months—while the Portuguese fleets were based on Lisbon, which could only be reached after a six months' voyage; and experience had proved that almost every Portuguese factory required a fortress for its defence when the fleets were absent. Portugal, like every great maritime trading community from Carthage to Venice, discovered that the ideal of “sea power and commerce” led directly to empire. ”
