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This is CBS on the world.

I'm John Batcher. Patrick O'Donnell, his new book, The Indispensibles, the Diverse Soldier Mariners who shape the country, formed the Navy, and rode Washington across the Delaware.

Right now we want to discover Marblehead.

About 18 miles to the northeast of Boston, on the water, and it is a prosperous town in the 18th century.

Patrick, you estimate about 5,000.

Its business was fishing.

What was its relation to Boston and Massachusetts' economy?

It's the second largest port city in Massachusetts, and it's a thriving cosmopolitan city.

And it's fortunes are made on fish, specifically codfish.

And the men of Marblehead fish the Grand Banks.

This is, you know, well over a thousand miles to the north up near Nova Scotia.

But the Grand Banks are teeming with cod fish, in some cases which are, you know,

hundred pounds or more, John. And they fish the Grand Banks, bring back the cod, and then they

trade the cod, which they put in salted barrels for other goods.

And they have a massive merchant fleet that they've developed where they trade around the world and bring goods in and out of Marblehead.

In 1774, October of 1774, Marblehead obeys the orders, the directions, the guidelines of the Massachusetts Provincial Congress to form a militia.

These are the Minutemen that are at Lexington Concord.

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