In this research, parliamentary investigations in the UK during the Crimean War (1853-1856) are under consideration. On the basis of the historical-genetic method of research, the features of the domestic and foreign policy of the government of Aberdeen, which was dismissed after the end of the war, are analyzed. It is shown that there were disagreements in the government regarding the country's entry into the war, the organization of medical and military departments. The war became part of a factional and cross-party struggle for power. During the Crimean War, soldiers of the British army died in military hospitals from epidemics of typhus and cholera, lack of food and medical supplies. The military expedition to the Crimea, undertaken by Great Britain using funds insufficient to carry out military operations, became the reason for parliamentary investigations and the resignation of the British government. The object of criticism of the parliament was the lack of vehicles, the outdated system of military training, medical and food security. Corruption in the British government and the army, the commission system was named as the reason for the death of British soldiers in the Crimea. Parliamentary investigations were considered a national affair, which was supposed to lead to a restructuring of the state system. The consequences of the war were the reorganization of the administration of the army and the care of the wounded, an attempt to overcome corruption in Britain and the resignation of the government.