I've finished 'The Great Army' and it can be downloaded from the 'latest Medieval uploads' section of this site ( beyond 'upload a file' ). I haven't used a link, since the files will eventually be moved to be with the other campaigns. The only original file which will be overwritten is loc/startpos, to add the description of the campaign.

This is the Campaign Guide from the ReadMe:

Campaign Guide

The campaign is intended to be played at the expert level of difficulty. It begins in 867, with the Great Army in possession of York, and ends in 1016, when Cnut's invasion and conquest made England part of his Viking kingdom.

Irish- harder than the level chosen. The Irish are poor and divided amongst themselves. It may not be difficult to expel the Vikings from Dublin, but they will still retain control of the seas. The Saxons are building a navy as well.

Mercians- easier than the level chosen. The Mercians are still wealthy and powerful in 866, if no longer the overlords of England. Though that wealth is sure to tempt the dangerous Great Army, just to the north, the Mercian provinces are inland and are not as vulnerable to sea-borne raids as those of Wessex.

Northumbrians- much harder than the level chosen. If the Northumbrians accept the loss of Dere, they become much weaker- if they attempt to retake it they risk a catastrophe.

Saxons- much easier than the level chosen. Since 825 Wessex has been the leading kingdom of England. However, the kingdom is not organised for war and there are no ships to guard the vulnerable east and south coasts. The war in the north reduces the risk of Viking raids, allowing the Saxons to prosper in peace, for a time.

Scots- harder than the level chosen. After decades of civil war and treachery most of Scotland is at last united under one king. A prudent Scottish ruler can use the Great Army as an opportunity to deal with the weaker Vikings to the north, the English kingdoms on the lowland territory to the south and any rebels or resurgent Picts.

Vikings- much easier than the level chosen. Seapower has brought the Vikings territory all over Britain, but the less wealthy outposts have to be defended whilst England is plundered.

Welsh- harder than the level chosen. The Welsh have a long land border to defend against the Mercians, who may renew their attacks on their oldest enemy, despite the Viking threat.