This poster was produced by the Provisional Irish Republican Army during the period of armed conflict in Northern Ireland popularly known as ‘The Troubles’. In 1969, following growing tension between Unionist and Nationalist communities, the British government sent troops to patrol the streets of Northern Ireland. By the time this poster was published there was open conflict between armed Republicans and the British army. The poster warns Nationalists that undercover agents working for the British army might be operating in disguise. This poster, along with others like it, became known as the ‘split Brit’. The poster offers a striking starting point for exploring the role and impact of the British army and the Troubles more generally.