Drying in the Sun: 21 Women and an Open Window

Quick gut-check before you read on: walk your bay in your head right now. What’s staged where it shouldn’t be? Is your exit actually clear, or is there a pallet in front of it? Hold that thought — because today’s story is about a man who staged something dangerous right next to people who had no say in it, and 21 of them never went home. It happened this week in 1864, and the lesson is sitting in your building right now.

Just before noon on a hot June day, the Washington Arsenal — where Fort McNair stands today — blew apart. Inside one long warehouse, 108 women were filling small-arms cartridges with gunpowder for the Union Army. Most were working-class, many were Irish immigrants. One of them, Sallie McElfresh, was 13 years old.

That morning the arsenal superintendent, Thomas Brown, had a batch of freshly made signal flares he wanted dried. So he set them out in metal pans in the direct sun — a few feet from the building full of people and powder. The flares were packed with potassium chlorate, strontium nitrate, and carbon. In the heat, they ignited. Fire shot through an open window into the hottest room of the building, touched off the loose cartridges and a barrel of gunpowder, and tore the roof clean off.

The women never had a chance. Their hoop skirts caught fire as they ran. The heavy worktables they had been sitting at had been pushed against the windows and doorways — so the way out was blocked by the very furniture they worked on. Twenty-one died. Some were burned beyond recognition and identified only by a ring or a scrap of dress. President Lincoln and Secretary of War Stanton walked in the funeral procession to Congressional Cemetery, where a monument to them still stands.

The coroner’s inquest didn’t mince words. Brown was found guilty of placing highly combustible substances so near a building filled with human beings that it showed, in the jury’s words, a reckless disregard of human life. He was never charged with anything. And here’s the part that should sit with you: nothing meaningfully changed. The arsenal had more explosions in the years that followed.

Translate it to the floor. This was 75 years before OSHA existed, but the two hazards that killed those women are nailed down in the rulebook today. First, 29 CFR 1910.109 (explosives and blasting agents): you keep things that can ignite or detonate separated, away from ignition sources and away from people. You don’t stage flares in the sun next to a room full of gunpowder. Second, 29 CFR 1910.36 and 1910.37 (exit routes): the way out has to be clear and unobstructed, period. A table, a pallet, a tote — anything blocking the door turns a survivable fire into a body count.

The trigger. Strip away the hoop skirts and the year. What actually happened is this: somebody put a hazard right next to where people worked because it was convenient, and the only way out was blocked by the work itself. That’s not freak bad luck — that’s a setup, and the people closest to it had no authority to say “this is wrong.” Look at your own building today. What’s staged where it shouldn’t be? And if the alarm went off right now, could your crew actually get out, or would they be climbing over a table?

Trench Safety Stand Down is this week — June 15 to 19. OSHA and the National Utility Contractors Association are running the annual stand-down to put excavation safety front and center. A trench collapse happens in seconds, and a single cubic yard of soil weighs around 3,000 pounds — about the weight of a small car landing on someone who can’t move. 29 CFR 1926.652 is blunt about it: any trench five feet or deeper needs a protective system — slope it, shore it, or shield it — and a competent person has to inspect it daily and after every rain. So what for safety leaders: you don’t need a budget or a memo to act on this. Pull your crew together this week, confirm the trench box is actually on site before anyone digs, and give your competent person real authority to stop the job. No box, no entry — full stop.

OSHA’s updated Heat National Emphasis Program is now in force. As of April 10, 2026, OSHA extended and revised its heat NEP for another five years, retargeting it at 55 high-hazard indoor and outdoor industries, dropping the old numerical inspection quotas, and adding a dedicated appendix on citation guidance. Heat inspections have climbed from a couple hundred a year to several thousand. The proposed federal heat standard, meanwhile, is still stuck in rulemaking with no finalization date. So what for safety leaders: don’t wait for the standard. Between the General Duty Clause and an active NEP, heat is being inspected and cited right now. Have a written plan before the next heat wave — water, rest, shade, and a real acclimatization schedule for new and returning workers, who are the ones who go down first.

A crew was setting pipe in a six-foot trench. The trench box was on another job across town, and the concrete truck was already scheduled. One worker hopped in “just for a minute” to make a connection — no shoring, no box, walls of fresh-cut clay on both sides. Nothing happened. Everybody went home. But a foreman watching from the edge felt his stomach drop, because he’d seen what “just a minute” looks like when it goes the other way.

Here’s the blameless read: that worker isn’t reckless. The box wasn’t staged on site (a planning and logistics gap), the schedule was squeezing everyone (production pressure), and “just a minute” had quietly become normal because it had always worked before. The system made the wrong move the easy move. What we’d change: stage the protective system before the dig, not after; build the schedule around the box being there; and make it dead clear that the competent person can halt the pour with zero blowback. The goal isn’t to find someone to blame — it’s to make “no box, no entry” the path of least resistance.

Got a fail or a near-miss? Hit reply. We’ll feature it anonymously — no names, no company, no blame. Just the lesson, so the next crew doesn’t learn it the hard way.

Today, pick ONE thing and fix it: clear one blocked exit, confirm the trench box is on site before anyone goes in, or top off the water cooler and point your crew to the shade. Then find the person closest to the work and ask them one question — “What’s the one thing here that could hurt you that I’m not seeing?” — and actually listen to the answer. The women at the arsenal saw the danger. Nobody asked them, and nobody would have listened. You can be different.

Please stay Safe & Hydrated!!!