Ahmedou Ould Boukhary knows he can get the call at any time, day or night from the local authorities in Bassikounou, a town in the south-east of Mauritania. Someone has spotted a fire in one of the villages perched on the edge of the Sahara. How soon can he and his men be there? Boukhary leads the Brigade Anti-Feu – the Anti-Fire Brigade – a volunteer force of about 500 Malian refugees living in M’bera camp, towards the border with Mali, 11 miles (18km) from the town. When the call comes, teams of between 50 and 70 men pack themselves into the backs of pickup trucks and zoom out of the camp to deal with the blaze. Sometimes they travel up to 20 miles to put out fires. With little more than axes and tree branches, the brigade helped to put out 36 fires in and around the camp since October, during the most recent dry season, which runs until June. The fires typically come after the rains, when scrubland, full of green plant life, slowly becomes a tinderbox. During a recent practice run, the trucks race into the desert. When they halt, the men jump out and start hacking at a small tree, passing its wispy branches around to use as makeshift brooms. They form a line, and start sweeping at the ground just as they would if putting out a real fire. Dust and sand billows into the hot air, which fills with the sound of excited shouts. The equipment may be modest, but branches used well are enough to stamp out many scrubland fires. “It’s a little tiring, it’s a little risky,” says Mine Hamada, one of the brigade leaders. “We have the courage to not be afraid. We’re brave – we go at midnight, we go at 1am, we go at whatever hour. We go into the bush. There are snakes, there’s everything – but we attack the wildfires.” An influx of thousands of refugees escaping an upsurge in violence and rising insecurity in Mali since March has reduced the number of callouts this year. The hungry livestock they brought with them ate many of the shrubs and trees that would have posed a fire risk. Between October 2020 and June 2021, the teams extinguished 58 fires. Founded in 2013 as an initiative between the Mauritanian NGO SOS Desert, the local authorities and the UN high commissioner for refugees, the brigade is among a number of volunteer groups that have sprung up in M’bera since the camp was established 10 years ago. The camp is home to about 80,000 Malians. As well as putting out fires, the refugee fire brigade attempts to mitigate the risk of blazes by cutting down trees and shrubs to create firebreaks between patches of vegetation. The brigades also plant trees to replace those cut down to make homes in the camp and for cooking. These efforts are contributing towards the Great Green Wall – a massive reforestation project that aims to grow an 4,350-mile-long barrier to combat environmental degradation in the Sahel. Miraculously, the brigade has only incurred one injury over the past nine years, Hamada says. Amid high winds, a man tripped and fell into a fire he was battling. His fellow firefighters were able to pull him to safety before he could be seriously hurt. The volunteers say they take on the dangerous work, which often has them out in the field for hours at a time, because they want to protect the area in which they live. But they also do it out of gratitude – to pay back their Mauritanian hosts for the years they have spent as refugees. “We must help les adoptants,” says Boukhary, referring to the local Mauritanians who, by accepting the Malians into their country, he suggests have “adopted” them. “We intervene to help them. Because we’re refugees on their territory. No one asked us to ‘Do this, do that’ – it’s our initiative.”