Marking and choosing the battle-field—The war arrow—Peace and war shields—Age when called to arms—The guest expected to fight for his host—War horses—Formation of an army—Standards—War booty—Chivalry in war. To such warlike people, well-regulated laws or customs in regard to war were necessary. It seems to have been the right, from very ancient times, of the chief whose land was invaded to choose the battle-field[109] where the conflict was to take place. The battle-field was marked with poles, and no plundering was allowed before the end of the decisive battle. The messengers who brought the summons for the conflict, and those who afterwards came to announce that the combatants were ready, were protected. “King Hakon sent word to the sons of Eirik (Blood-axe), and asked them to go ashore, as he had enhazeled a field for them at Rastarkalf; there are level and large plains, on the top of which is a long but low hillside. Then Eirik’s men left their ships” (Hakon the Good’s Saga, c. 24; Heimskringla). After the declaration of war the war-arrow was sent, to summon the warriors, when all who were able to carry arms had to turn out, whether thralls or free men. The sending of the war-arrow seems to imply that the message should be carried swiftly. “When a man carries war-news he shall raise an iron arrow at the end of the land. That arrow shall go with the lendirmen, and be carried on a manned ship both by night and by day (i.e., never stop) along the high road (on the sea). Those who drop that arrow are to be outlaws. A wooden arrow shall go into the fjords from the high road, and be carried with witnesses, and each man shall carry it on to the other. The one who drops it must pay a fine of three marks. When it comes where a woman lives alone, she must procure ships and food and men if she can. But if she cannot, the arrow shall be carried onwards. Every man in whose house the arrow comes is summoned within five days on board a ship. If any one sits quiet he is outlawed, for both thegn and thrall shall go”[110] (Earlier Gulathing Law, c. 312). “When news came to Einar Thambarskeltir about King Olaf’s journey, he at once took a war-arrow and sent it in four directions, summoning thegn and thrall with full war-dress to come and defend the country against the king. The arrow summons went to Orkadal, and then to Ganlardal, and all the host gathered together”[111] (St. Olaf’s Saga, c. 37). Every warrior went to battle combed and washed, and after having eaten well.