The two Roman invasions of Britain by Julius Caesar were the largest troop landings ever made in Britain -- until that of Claudius a century later. And Claudius' numbers remain the record right up to the present day.
The Roman navy cleared the Seven Seas of piracy for 400 years. The Romans planted at least one outpost in Ireland, and like the Greeks before them sowed colonists in India and elsewhere to the east.
Also, I'd like to point out that the Netherlands went far and wide until its conquest by the Hapsburgs and a long series of other rebellions, invasions, occupations, and other wars. There, that should give some of my ancestors a good night's sleep. ;')
And I was surprised that nobody told you that the Brits kicked the Dutch ass three times in a row in the 1600’s