On 16 April 2012 the Taliban launched their most ambitious ever attack on Kabul, targeting parliament and the diplomatic enclave. The assault caught the city by surprise, but so did the response of Afghanistan's security forces, who for perhaps the first time ever were fully in charge of the fight against the insurgents.When multi-media project Kabul: A City At Work got exclusive access to police commando Hamidullah – captured on camera in his bloodied combat fatigues – he became the face of Afghan heroism. This is his story …