Alfred the Great
Alfred the Great acted as his own spy,visiting Danish camps disguised as a minstrel.In those days, wondering minstrels were welcome everywhere, they were not fighting men, and their harp was their passport.Alfed had learned many of ballads in his youth, and could very his program with acrobatic tricks and simple conjurings.
while Alfred's little army slowly began to gather at Athelney, the king himself set out to penetrate the camp of Guthrum, the commander of danish invaders. These had settled down for the winter at Chippenham: thither Alfred went. He noticed at once that discipling was slack, the Danes had the self-confidence of conquerors, and their security precautions were casual. They lived well, on the proceeds of raids of the neighbouring regions. There they collected women as well as food and drink,and a life of easy had made them soft.
Alfred stayed in the camp a week before he returned to Atheley. The force there assembled was trivial compared with the Danish horde. But Alfred had deduced that the Danes were no longer fit for prolonged battle,and the commissariat had no organization, but depended on irregular raids.
So, faced with the Danes's advance, Alfred did not risk open battle but harried the enemy. He was constantly on the move, drawing the danes after him. His patrols halted the raiding parties.: hunger assailed the Danish army. Now Afred began a long series of skirmishes- and within a month the Danes surrendered. The episode could reasonably serve as a unique epic of royal espionage!