 Having completed their task and on leaving the compound, they were attacked by small arms fire and fatally wounded.They were based in Forward Operating Base Ouellette in the Nahr-e Saraj district of Helmand province, Afghanistan.On 9 August, Lieutenant Andrew Robert Chesterman, aged 26, from 3rd Battalion The Rifles, was commanding a vehicle patrol in the Nad-e-Ali district of Helmand province when the lead vehicle struck an improvised explosive device.