This entry isn't going to be as in-depth as the other posts I've been doing on Seven Soldiers as I'm not identifying any new themes or ways of looking at the material, merely pointing out a novel that I think almost certainly provided some of the inspiration for the series, but that I don't recall being mentioned anywhere else. As a result, it's only a few paragraphs long, and I'm just pointing out similarities, not drawing conclusions. I'll be doing more of that in tomorrow's post, which will be much longer than this one.
Morrison has described the structure of the collected versions of Seven Soldiers as being "like a Stephen King book", and I'm pretty sure he had a specific Stephen King book in mind when he said that, because the parallels with King's book It are much greater than most people appear to have picked up on.
It is represented as the personification of destruction and consumption, somewhat equivalent to the personifications of entropy scattered throughout Seven Soldiers, and is also portrayed as a giant spider. It is from a realm outside spacetime known as the Macroverse.
All these things are parallels, as is the fact that It mentions a Roanoke-like event in Derry' s past. But there are closer similarities.
It, like Seven Soldiers, deals with a team of seven. In fact their story in many ways parallels that of the Newsboy Legion - working together as children to defeat a menace that the adults don't believe in, but drifting apart after that, then working together when the menace resurfaces. The seven are all damaged in some way by the event, but most go on to wealth and fame.
In both stories when the menace returns in the present day, it is fought by a team of six, rather than seven.
Almost all King's characters have fathers who are absent or outright evil.
I'm not sure what to make of these similarities, but I thought I'd throw them out there for people to comment on - a more thorough, analytical post will be up tomorrow.