permanent town, St. George's (then called New London) was placed on the north side of St. George's Harbour. St. George's Harbour could be accessed directly by channels from the East. Those channels, however, were shallow, suitable, originally, only for small ships. As a consequence, and despite any major settlement on its shores, Castle Harbour was an important anchorage in the early years of the colony, with its main entrance, Castle Roads being an important route in from the open Atlantic for shipping. It was also a weakpoint, as it was remote from the defences of St. George's Harbour, and difficult to reach. It was quickly fortified and garrisoned by a standing militia. Initial fortification by the Virginia Company's (Bermuda was originally settled as an extension of Virginia) first deliberate settlers in 1612, was around the inlets to St. George's Harbour, but by the end of that year work had commenced on Castle Harbour's defences, starting at Castle Island (previously called Gurnett's Head, and King's Island. As a temporary measure, two guns had been salvaged from the 1609 wreck of the Sea Venture, one of which was installed on Castle Island ) in 1612. Proper fortifications were soon raised under the instructions of Governor Richard Moore. King's Castle is, today, the oldest surviving English fortification in the New World. It is Bermuda's oldest standing stone building, predating the State House. Its Captain's House, built a year after the State House, in 1621, is the oldest stone home in Bermuda. It is also the oldest standing English house in the New World. In 1614, King's Castle famously repulsed Spain's only ever attack on Bermuda. Two shots were fired from its artillery. Although neither struck, the Spanish vessel abandoned the attack (its crew did not realise that the gunners in the fort had only enough ammunition for one more shot). This fort was used as late as the Second World War by Bermuda's military garrison, with soldiers living in tents within its walls, watching over the channels with machine guns. Other forts built at the south of Castle Harbour included Devonshire Redoubt (1620) and the Landward Fort, on Castle Island, Southampton Fort (1620), on Southampton Island (originally known as Moore's Island and Brangman's Island), at the east side of Castle Roads, Old Castle, or Charles' Fort, (1615), on Goat Island, Pembroke Fort, on Cooper's Island, and Fort Bruere, on the Main Island. Other