The summer of 1916 had been dry across northern Ontario. Settlers in the Abitibi region were clearing land the way they always had: by slash-and-burn, felling trees and lighting the debris. It was standard practice in a landscape where forest seemed infinite and labor was scarce. Small fires smoldered through the bush for weeks. Smoke had hung over the region so long that people stopped noticing it. There was no forest fire monitoring service -- no rangers, no watchtowers, no system for tracking what the settlers were lighting. In the days leading up to July 29, the scattered fires began to merge. The wind picked up. Dry underbrush and bone-dry slash piles fed the growing blaze. By the time anyone understood what was happening, the individual fires had joined into a single firestorm, a wall of flame that at its widest measured 64 kilometers across. There was almost no warning. The conflagration arrived with the speed of weather.

The firestorm moved northeast through the bush, consuming everything combustible in its path. Porquis Junction, Iroquois Falls, Kelso, Nushka, Matheson, and Ramore were destroyed completely. Homer and Monteith suffered extensive damage. A separate fire burned in and around Cochrane. In all, approximately 500,000 acres -- 2,000 square kilometers -- of forest and settlement were reduced to ash. The official death toll was 223, though the true number may have been higher in a region where isolated homesteaders were not always counted. Some residents escaped on the Temiskaming and Northern Ontario Railway, the trains threading through walls of fire and smoke to carry survivors south. Others waded into the Black River or one of the small lakes scattered across the landscape, standing chest-deep in water while the fire roared overhead. The heat was intense enough to kill people in the water. Those who survived described a sky turned black at midday, embers raining like snow, and a sound like a continuous explosion as the firestorm consumed the oxygen around them.

The destruction forced Ontario to confront its complete absence of fire management infrastructure. Within a year, the provincial government passed the Forest Fires Prevention Act of 1917, creating a modern fire control system for the first time. The legislation required permits for all land-clearing fires, ending the casual slash-and-burn practices that had fed the 1916 conflagration. The government established the Forest Protection Branch within the Department of Lands, Forests, and Mines -- the predecessor of today's Ministry of Natural Resources and Forestry -- and hired 1,000 rangers to patrol the northern bush. Watchtowers went up. Reporting systems were established. The Matheson Fire did not merely destroy towns; it created the institutional framework that would govern Ontario's relationship with wildfire for the next century. The towns themselves were rebuilt, some under new names. Nushka became Val Gagne. Iroquois Falls recovered around its paper mill. Matheson endured.

An Ontario Heritage Foundation plaque stands in Alarie Park near Matheson, a quiet marker for a catastrophe that reshaped policy and geography alike. The great fire is the subject of Michael Barnes's book Killer in the Bush and Jocelyne Saucier's novel Il pleuvait des oiseaux, which translates to "it was raining birds" -- a title drawn from accounts of birds falling from the sky, killed by heat and smoke before they could escape. A monument to Father Gagne stands in the Val Gagne Cemetery. The boreal forest that burned has long since regrown; from the air, there is no visible scar. The land around Matheson and Iroquois Falls looks like every other stretch of northern Ontario -- spruce and birch and muskeg extending to the horizon. But the communities remember. The fire is woven into local identity, a founding story for a region that learned, in a single afternoon, what happens when human carelessness meets a dry forest and a rising wind.