The 18th Brigade was formed from a mixture of regular and New Army battalions, and was part of the 6th Division.

[1] Components included:[1] The following commanded the 18th Infantry Brigade during the First World War:[2] The brigade was originally designated as Cairo Area and 18th Infantry Brigade but ceased to exist when in May 1940 it was absorbed by HQ Cairo Sub-Area.

It was disbanded in Italy on 1 January 1945 due to an acute manpower shortage throughout the British Army at the time with all available replacements being sent to the 21st Army Group in the North West Europe Campaign.

[4] The original 18th Infantry Brigade was constituted as follows:[5] From 20 July 1943 the 18th Lorried Infantry Brigade was constituted as follows:[6] Commanders included:[7]

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