Question: Where did Harald Hardrada camp on the night of 13 October?
About the article "Battle of Hastings", section "Harold moves south".

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Harald or Harold is the name of several kings and lesser rulers:Kings of Denmark  Harald Bluetooth (935–985/986) Harald II of Denmark Harald III of Denmark Kings of England  Harold Harefoot (c. 1015–1040)   Harold Godwinson (c. 1022 – October 14, 1066)  Kings of Norway  Harald Fairhair (c. 850–c.
933)  Harald Greycloak (died 976)  Harald Hardrada (born 1015 – died at the Stamford bridge, England, September 25, 1066)  Harald Gille (reigned 1130–1136) Harald V of Norway (born February 21, 1937), present King of Norway.
Grand Dukes of Kiev Mstislav the Great, known as Harald in Norse Sagas King of Mann (Norwegian vassal) Harald I of Mann (died 1248), also known as Harald the Black.
Earls of Orkney (Norwegian vassals) Harald Haakonsson (died 1127) Harald Maddadsson (c. 1134 – 1206) Harald Eiriksson Other people Harald Bohr (1887–1951), Danish mathematician Harald Sandberg (born 1951), Swedish diplomat  
Harold's brother Tostig and Harald Hardrada invaded Northumbria in September 1066 and defeated the local forces under Morcar and Edwin at the Battle of Fulford near York.
King Harold received word of their invasion and marched north, defeating the invaders and killing Tostig and Hardrada on 25 September at the Battle of Stamford Bridge.
The Norman fleet finally set sail two days later, landing in England at Pevensey Bay on 28 September.
William then moved to Hastings, a few miles to the east, where he built a castle as a base of operations.
From there, he ravaged the interior and waited for Harold's return from the north, refusing to venture far from the sea, his line of communication with Normandy. 
However, around 1045 the aging Einar ran out of luck.
At this point, Olaf Haraldsson's half-brother Harald Sigurdsson, later dubbed "Hardrada", returned with a vast fortune amassed as a military commander in Byzantium.
According to the succession laws put in place by the earlier monarch Harald Fairhair, Harald had a legitimate claim to the throne, a claim he did not hesitate to put forward.
Fearing that Harald would turn his economic power into military power, Magnus against Einar's advice let Harald become joint monarch in late 1046.
Only a year later, Magnus died, and the strong-willed Harald became sole monarch.
Harald was determined to centralize power, and had little patience with the quarreling nobles and peasant leaders.
Thus, he was bound to end up on a collision course with the equally determined Einar Thambarskelfir.
Conflict ensued, threatening civil war, and Einar began raising another peasants' army against the increasingly unpopular and tyrannical Harald.
However, before this work was completed, Harald appeared to seek reconciliation.
He asked Einar for a meeting at his farm in Nidaros, so that the two could sit down and broker an agreement.
Harald, of course, had no such intentions.
He had decided that Einar had to be removed before his support was too powerful.
Thus, when arriving at the king's farm, Einar and his son Eindride were assassinated. 
After defeating his brother Tostig and Harald Hardrada in the north, Harold left much of his forces in the north, including Morcar and Edwin, and marched the rest of his army south to deal with the threatened Norman invasion.
It is unclear when Harold learned of William's landing, but it was probably while he was travelling south.
Harold stopped in London, and was there for about a week before Hastings, so it is likely that he spent about a week on his march south, averaging about per day, for the approximately .
Harold camped at Caldbec Hill on the night of 13 October, near what was described as a "hoar-apple tree".
This location was about from William's castle at Hastings.
Some of the early contemporary French accounts mention an emissary or emissaries sent by Harold to William, which is likely.
Nothing came of these efforts.
Although Harold attempted to surprise the Normans, William's scouts reported the English arrival to the duke.
The exact events preceding the battle are obscure, with contradictory accounts in the sources, but all agree that William led his army from his castle and advanced towards the enemy.
Harold had taken a defensive position at the top of Senlac Hill (present-day Battle, East Sussex), about from William's castle at Hastings.
Maria Haraldsdotter (died 25 September 1066) was a Norwegian princess, as the daughter of Harald Hardrada and Elisiv of Kiev.
She is the first known Norwegian to have been named Maria.
According to "Heimskringla", Maria, together with her sister Ingegerd and mother, went with Harald on his expedition to Britain in 1066.
Maria, Ingegerd and Elisiv were however left behind at Orkney, where Harald gathered reinforcements.
By the Battle of Stamford Bridge, in which Harald was killed, Harald had promised Maria away for marriage to Eystein Orre (brother of Harald's concubine or second wife Tora Torbergsdatter), who also died at Stamford Bridge.
When Harald's son Olaf and the rest of his fleet arrived back in Orkney, they learned that Maria had suddenly died on the same day that her father had died in battle.