Answer:
As a puritan, William Bradford saw the world based on the idea that God was good and evil at the same time. So, every event that happened during the voyage was credited to God (for good, or for bad).
Step-by-step explanation:
Let's se some examples.
According to William Bradford's History of Plymouth Plantation (1620 - 1647), he describes how an arrogant sailor was abusing the puritans. Bradford wrote that God would punish him, and save the puritans. He describes the sailor as "a young and profane young man", and following,
"But it pleased God before they came half seas over, to smite this young man with a grievous disease, of which he died in a desperate manner, and so was himself the first that was thrown overboard." (IX:58)
In other passage, when a sailor fall from the ship, Bradford write that, if the sailor was righteous, God would save him.
". . . but it pleased God that he [the sailor] caught hold of the top-sail halyards . . . (though he was several fathoms under water) till he was hauled up by the same rope. . . . and his life saved. . . . " (IX:124)
In other words, God was always present on the trip. We have to consider other aspects also, especially the sickness and storms that tormented the crew.