How 'ard Was William The Conqueror?

Answer: Very 'ard indeed.

His invasion force landed at Pevensey in Sussex on 28 September and erected a wooden castle at Hastings, from which they raided the surrounding area. King Harold quickly marched south to confront him, leaving many of his forces behind in the north. On 14 October Harold's army confronted William's invaders near Hastings. After an all-day battle, Harold's army was defeated and he was killed. William therefore advanced, marching around the coast of Kent to London. He defeated an English force that attacked him at Southwark, but being unable to storm London Bridge he sought to reach the capital by a more circuitous route.
William moved up the Thames valley to cross the river at Wallingford, Berkshire; while there he received the submission of Stigand. William then travelled northeast along the Chilterns, before advancing towards London from the northwest, fighting further engagements against forces from the city. Having failed to muster an effective military response, Edgar's leading supporters lost their nerve, and the English leaders surrendered to William at Berkhamsted, Hertfordshire.
William was acclaimed King of England and crowned by Ealdred on 25 December 1066, in Westminster Abbey. William remained in England until March, when he returned to Normandy with a number of English prisoners.

In 1067 rebels in Kent launched an abortive attack on Dover Castle in combination with Eustace II of Boulogne. In the same year the Shropshire landowner Eadric the Wild, in alliance with the Welsh rulers of Gwynedd and Powys, raised a revolt in western Mercia, fighting Norman forces based in Hereford. These events forced William to return to England at the end of 1067.
In 1068 William besieged rebels in Exeter, including Harold's mother Gytha, and after suffering heavy losses managed to negotiate the town's surrender.

Later in the year Edwin and Morcar raised a revolt in Mercia with Welsh assistance, while Gospatric, the newly appointed Earl of Northumbria, led a rising in Northumbria, which had not yet been occupied by the Normans. These rebellions rapidly collapsed as William moved against them, building castles and installing garrisons as he had already done in the south. Edwin and Morcar again submitted, while Gospatric fled to Scotland, as did Edgar the Ætheling and his family, who may have been involved in these revolts. Meanwhile Harold's sons, who had taken refuge in Ireland, raided Somerset, Devon and Cornwall from the sea.

The Harrying (or Harrowing) of the North, was a series of campaigns in the winter of 1069–1070 to subjugate northern England. It effectively ended the quasi-independence of the region through large-scale destruction that resulted in the relative "pacification" of the local population and the replacement of local Anglo-Danish lords with Normans. A contemporary Anglo-Norman chronicler wrote that the death toll, due to the Harrowing, was over 100,000. Because of the scorched earth policy, much of the land was laid waste and depopulated, a fact to which the Domesday Book, written almost two decades later, readily attests.

Early in 1069 the newly installed Norman Earl of Northumbria, Robert de Comines, and several hundred soldiers accompanying him were massacred at Durham; the Northumbrian rebellion was joined by Edgar, Gospatric, Siward Barn and other rebels who had taken refuge in Scotland. The castellan of York, Robert fitzRichard, was defeated and killed, and the rebels besieged the Norman castle at York. William hurried north with an army from the south, defeated the rebels outside York and pursued them into the city, massacring the inhabitants and bringing the revolt to an end. He built a second castle at York, strengthened Norman forces in Northumbria and then returned south. A subsequent local uprising was crushed by the garrison of York. Harold's sons launched a second raid from Ireland and were defeated in Devon by Norman forces under Count Brian, a son of Eudes, Count of Penthièvre. In the late summer of 1069 a large fleet sent by Sweyn II of Denmark arrived off the coast of England, sparking a new wave of rebellions across the country. After abortive raids in the south, the Danes joined forces with a new Northumbrian uprising, which was also joined by Edgar, Gospatric and the other exiles from Scotland as well as Waltheof. The combined Danish and English forces defeated the Norman garrison at York, seized the castles and took control of Northumbria, although a raid into Lincolnshire led by Edgar was defeated by the Norman garrison of Lincoln.

At the same time resistance flared up again in western Mercia, where the forces of Eadric the Wild, together with his Welsh allies and further rebel forces from Cheshire and Shropshire, attacked the castle at Shrewsbury. In the south-west, rebels from Devon and Cornwall attacked the Norman garrison at Exeter, but were repulsed by the defenders and scattered by a Norman relief force under Count Brian. Other rebels from Dorset, Somerset and neighbouring areas besieged Montacute Castle but were defeated by a Norman army gathered from London, Winchester and Salisbury under Geoffrey of Coutances. Meanwhile William attacked the Danes, who had moored for the winter south of the Humber in Lincolnshire, and drove them back to the north bank. Leaving Robert of Mortain in charge in Lincolnshire, he turned west and defeated the Mercian rebels in battle at Stafford. When the Danes attempted to return to Lincolnshire, the Norman forces there again drove them back across the Humber. William advanced into Northumbria, defeating an attempt to block his crossing of the swollen River Aire at Pontefract. The Danes fled at his approach, and he occupied York. He bought off the Danes, who agreed to leave England in the spring, and through the winter of 1069–70 his forces systematically devastated Northumbria.

In spring 1070, Sweyn II of Denmark renounced the earlier agreement to withdraw, sending troops into the Fens to join forces with English rebels led by Hereward the Wake, based on the Isle of Ely. Soon, however, Sweyn accepted a further payment of Danegeld from William and returned home. The Fenland rebels remained at large, protected by the marshes, and early in 1071 there was a final outbreak of rebel activity in the area. Edwin and Morcar again turned against William, and while Edwin was soon betrayed and killed, Morcar reached Ely, where he and Hereward were joined by exiled rebels who had sailed from Scotland. William arrived with an army and a fleet to finish off this last pocket of resistance. After some costly failures the Normans managed to construct a pontoon to reach the Isle of Ely, defeated the rebels at the bridgehead and stormed the island, marking the effective end of English resistance.
(Source:Wiki)