In 1665 the fort was repaired and enlarged,--the spirit of military preparedness which had been awakened by the Frenchman’s arrival having evidently been kept up. A small castle was added with brick walls and three stories in height. There was a dwelling-room on the first floor of this “castle”; a lodging-room above; a gun-room over the latter furnished with “six very good saker guns” and three lesser guns were mounted upon the roof. In this same year occurred an event which gave rise to much curious speculation at the time and is retained in legend. On the 15th of July a stroke of lightning entered one of the rooms of the fort, killed Captain Richard Davenport, the commanding officer, and did not enter the magazine, only a step away, beyond a thin partition, where there was stored enough gunpowder to have blown the fort beyond the seas.
Still the spirit of fire had its due, for in 1673 the fort was burned to the ground. In the year following a new fort of stone was erected. It had four bastions, mounted thirty-eight guns and sixteen culverins, in addition to a water battery of six guns, and was a very imposing work indeed.
In 1689 the people of Boston, favoring the Cromwellians in England, seized the royal governor, Edmund Andros, and placed him in confinement. They took possession of the castle and appointed Mr. John Fairweather commander to succeed Captain John Pipon.
But all dissension is smoothed down by the hand of Time. Under the administration of Sir Williams Phipps, an appointee of King William, the fort was named Castle William and the Crown donated a large sum of money toward the erection of a stronger structure. The ordnance then became 24 nine-pounders, 12 twenty-four pounders, 18 thirty-two pounders, and 18 forty-eight pounders; and the bastions became known by the names of the “Crown,” the “Rose,” the “Royal,” and the “Elizabeth.” This augmentation of strength was the more necessary as a French invasion of the New England colonies was apprehended.
And so we run on through the years: In 1716 Lieutenant Governor William Dummer, a well-known name in the history of Massachusetts, assumed command of Castle William, agreeable to orders from the Crown, and thereby incurred the ill-feeling of the general court of the province which heretofore had had prerogative in the appointment of a commandant. In 1740 the fort was repaired in anticipation of war with France and a new bastion mounting 20 forty-two pounders was created and named Shirley bastion.