Even before the officers began blasting away at miners' makeshift shelters, the Amazon rain forest nearby looked like a war-scape, pocked with craters and littered with the trunks of amputated trees.
Peru's anti-illegal mining czar, retired army Gen. Augusto Soto, marched the men six miles (11 kilometers) to the wasteland known as La Pampa, where 50,000 hectares of rainforest have been obliterated in the past six years.
They destroyed motors and dynamited a dozen motorcycles as they tore down dwellings that included at least one mud-flanked bordello. The miners had removed and hidden some machinery.
In addition to contributing to deforestation, which scientists blame for between 12 and 15 per cent of global greenhouse gas emissions, the illegal alluvial gold mining contaminates the jungle with tons of mercury.
Mercury is a toxin and has already contaminated the food chain, including fish, the local population's main protein source.
Peru's environment minister says the country loses about 400 square miles (between 100,000 and 120,000 hectares) a year to deforestation. The South American country will host UN-sponsored climate talks that start on December one.