An important figure was Sir Charles Wilson, a Royal Engineer who successfully pushed for reform of the War Office's treatment of topographical work.

On Bloody Sunday (1920) 15 British Military Officers and civilians were shot and killed during multiple attacks in Dublin.

[9] The Combined Allied Intelligence Corps as it was known in Malta, began recruiting in 1940 following Italy's entry into the war on the side of Germany.

[10] Among its many responsibilities in the Mediterranean Theatre were debriefing and interrogation of high-ranking prisoners of war in East Africa following Mussolini's invasion of Abyssinia ("Eldoret" P.O.W.

[10] The commission was established by Field-Marshal Sir Harold Alexander a few days after the fall of Rome in June 1944 to identify and reimburse Italian civilians who had assisted Allied escapees.

[11] Throughout the Cold War, Intelligence Corps officers and NCOs (with changed insignia) were posted behind the Iron Curtain in East Germany, to join in the intelligence-gathering activities of the British Commanders'-in-Chief Mission to the Soviet Forces in Germany (Brixmis).

[14] Within the British Army, soldiers of the Intelligence Corps are often referred to as Green Slime, or sometimes simply 'Slime', due to the colour of their beret.

[15][16][17] Their headquarters, formerly at Maresfield Camp, East Sussex, then Templer Barracks at Ashford, Kent, moved in 1997 to MOD Chicksands in Bedfordshire along with the Defence Intelligence and Security Centre (DISC).