The ‘From the Archives’ story along with BCS #123 is “The Proof of Bravery” by David Milstein, from BCS #88.
Ian McHugh’s “Cold, Cold War” in BCS #123 deals with paranormal consequences in a famous war in an early 20th-century Earth; “The Proof of Bravery” deals with paranormal consequences in a famous war in an early 19th-century Earth.
(If you haven’t noticed the From the Archives story listings, they are in the RSS feed for New Issues.
Every BCS issue listing there has a ‘From the Archives’ story appended to it: an older story from a past issue, which shares a theme or style or character or setting with one or both of the stories in the current issue.
We will also be posting about the From the Archives stories here on the News page and on the BCS Facebook and Twitter pages, so from here on you will be able to find them there too.)