The Halve Maen is on August 4…
September 1609 CE
The Halve Maen is on August 4 at Cape Cod, from which Hudson sails south to the entrance of Chesapeake Bay.
Rather than entering the Chesapeake he explores the coast to the north, finding Delaware Bay but continuing on north.
On September 3, he reaches the estuary of the river that initially is called the North River or Mauritius.
He isn't the first to discover the estuary, though, as it had been known since the voyage of Giovanni da Verrazzano in 1524.
John Colman of his crew is killed on September 6, 1609, with an arrow to his neck loosed by natives.
Hudson sails into the upper bay on September 11, 1609.
He begins a journey the following day up the river, which now bears his name.