The Aberdeen Fortress Royal Engineers was a Scottish volunteer unit of the British Army formed in 1908.

[1][2][3][4][5][6] The TF was mobilised on the outbreak of war in August 1914 and the City of Aberdeen Fortress Engineers took their place in the Scottish Coast defences.

[7] Once it was clear that the threat to Britain's coastal defences was small, six of the fortress engineer units reorganised as 'Army Troops' companies for service on the Lines of Communication of the British Expeditionary Force.

[11][8] Little is known of its service, other than it was on the Lines of Communication in January 1917, with IX Corps in September 1918, and Fifth Army at the time of the Armistice.

[16][18][19][20] In August 1939, Anti-Aircraft Command was mobilised and 51st AA Bn took its place in the air defences of Scotland.