Spies were, of course, slain if discovered. But we have instances of kings and heroes getting into foeman's camps in disguise (cf. stories of Alfred and Anlaf).
The order of battle of Bravalla fight is given, and the ideal array of a host. To Woden is ascribed the device of the boar's head, hamalt fylking (the swine-head array of Manu's Indian kings), the terrible column with wedge head which could cleave the stoutest line.
The host of Ring has men from Wener, Wermland, Gotaelf, Thotn, Wick, Thelemark, Throndham, Sogn, Firths, Fialer, Iceland; Sweden, Gislamark, Sigtun, Upsala, Pannonia.
The host of Harold had men from Iceland, the Danish provinces, Frisia, Lifland; Slavs, and men from Jom, Aland, and Sleswick.
The battle of Bravalla is said to have been won by the Gotland archers and the men of Throndham, and the Dales. The death of Harald by treachery completed the defeat, which began when Ubbe fell (after he had broken the enemy's van) riddled with arrows.
The defeated, unless they could fly, got little quarter. One-fifth only of the population of a province are said to have survived an invasion. After sea-battles (always necessarily more deadly) the corpses choke the harbours. Seventy sea-kings are swept away in one sea-fight. Heads seem to have been taken in some cases, but not as a regular Teutonic usage, and the practice, from its being attributed to ghosts and aliens, must have already been considered savage by Saxo, and probably by his informants and authorities.
Prisoners were slaves; they might be killed, put to cruel death, outraged, used as slaves, but the feeling in favour of mercy was growing, and the cruelty of Eormenric, who used tortures to his prisoners, of Rothe, who stripped his captives, and of Fro, who sent captive ladies to a brothel in insult, is regarded with dislike.
Wounds were looked on as honourable, but they must be in front or honourably got. A man who was shot through the buttocks, or wounded in the back, was laughed at and disgraced. We hear of a mother helping her wounded son out of battle.
That much of human interest centered round war is evident by the mass of tradition that surrounds the subject in Saxo, both in its public and private aspects. Quaint is the analysis of the four kinds of warriors: (a) The Veterans, or Doughty, who kill foes and spare flyers; (b) the Young men who kill foes and flyers too; (c) the well-to-do, landed, and propertied men of the main levy, who neither fight for fear nor fly for shame; (d) the worthless, last to fight and first to fly; and curious are the remarks about married and unmarried troops, a matter which Chaka pondered over in later days. Homeric speeches precede the fight.
"Stratagems of War" greatly interested Saxo (probably because Valerius Maximus, one of his most esteemed models, was much occupied with such matters), so that he diligently records the military traditions of the notably skillful expedients of famous commanders of old.