How flamethrowers were used?

Flamethrowers were primarily used during World War I and II as infantry weapons to clear trenches, bunkers, and enemy fortifications by projecting a stream of burning fuel. They created psychological terror and effectively cleared areas of troops and equipment. In addition to military applications, flamethrowers have also been used in controlled burns for land management and agriculture. Despite their effectiveness, their use has raised ethical and humanitarian concerns due to the severe burns they can inflict.