In those latitudes, the growing season was short, and there was little margin for error. The Old Norwegian Rune Rhyme speaks of the generosity of Frodhi. According to Rudolf Simek's Dictionary of Northern Mythology , Frodhi was a legendary Danish King during whose reign there was great peace. Wars do not facilitate good harvests. Think of the want and rationing that still go with wars today.
Wars lead to destroyed or stolen crops and livestock and loss of vital workforce, just for starters.
The Vikings, by the way, carefully timed their raids to fall between planting and harvest, so their farming would not suffer. It was considered great sacrilege to spill blood in Freyr's sacred fields and sanctuaries. Let the careful study of the Rune Jera bring expanding good into your own life. There are a number of links to their sites from my web page, and I encourage my readers to buy their excellent products. All of these books are well worth owning.