It seems weirdly logical that the month following Halloween was once called 'Blood Month'.
Cattle, or ox, appear to be the most common animal to be given in sacrifice. There are depictions of blood being collected and maybe this was given to the spirits of the trees. Or perhaps the Dark Ages peoples knew about blood being an excellent fertiliser for fruit trees. The meat would have been dried or salted and stored for winter consumption. When the shortest day arrived at the winter solstice, there would have been a great feast to celebrate the fact that people had made it through another year. Plenty of meat would have been eaten simply because there was little else.
So the new year started in the darkness of winter, with the sights, sounds and smells of animal sacrifice (some have argued that there were human sacrifices too). It gets darker and colder. The leaves die and fall from the trees. People succumb to illness and disease and die as well. November truly was an ugly, dark month.
The Anglo-Saxons, as those before them, hoped that there was enough meat to last. A bit of help from the gods and maybe they could live until the light wins out in the spring.
Interesting that the British royal family still hosts an annual hunting tradition in November. Here guests have a shooting party full of ritual pheasant shooting killing hundreds of birds. Although the royals of today will never go short of food throughout the winter, the tradition of Blood Month remains.
I really don't like November. But I am not in the right time nor place to complain so I consider the month as a time of remembrance. So I'll think about those who died in the past whether they be soldiers or ordinary folk.