94th Heavy Anti-Aircraft Regiment, Royal Artillery, was a Scottish air defence unit of Britain's Territorial Army (TA) formed around Edinburgh during the period of international tension leading up to the outbreak of World War II.

The regiment continued in the postwar TA until amalgamated in 1955 The Territorial Army was rapidly expanded following the Munich Crisis, particularly the Anti-Aircraft (AA) branch of the Royal Artillery (RA).

While the fighters flew out to sea to gain height, the battery fired three salvoes of rounds at fuze settings of 22, 28 and 30 seconds to direct them to the target.

This brigade was responsible for AA defence of the port of Mersa Matruh and several landing grounds (LGs), and air raids took place almost nightly.

[19][20] In September 1941 the WDF made a small advance to Halfaya Pass and 12 AA Bde moved up to Sidi Barrani to protect nearby LGs.

General Erwin Rommel's counter-attack caused confusion, with retreating units driving through the LGs and both Eighth Army and 12 AA Bde's HQs.

As 12 AA Bde fell back from the advanced LGs in a series of defensive deployments, its guns joined the garrisons of the 'boxes' that formed the British Gazala Line[19][20] The Battle of Gazala began on 26 May, and Rommel's Axis forces quickly broke into the British position, though the boxes held out, with 3.7-inch HAA guns firing in ground support.

The 11-day battle to break through the Axis lines opened on 23 October, and after the break-out the airfields at Gambut and El Adem were quickly secured, 12 AA Bde's units following close behind.

The brigade developed an efficient system of providing rolling support for the DAF's tactical wings as they made long shifts forwards to maintain contact with the advancing army.

They selected new sites for landing strips or renovated old ones, maintaining radio contact through RAF or RA channels with the main body so that movement orders could be passed to the following AA batteries.

Movement was usually by 'leap frogging' from previously occupied LGs, though sometimes an AA battery was waiting in a hidden concentration area ready to move forward.

12 AA Brigade had 20–30 separate convoys moving on any given day, and by November it was providing cover for six RAF wings and one US Army Air Force (USAAF) Group, and also manning dummy airstrips, compete with flare-paths, aircraft, flash simulators and people.

As the advance progressed the retreating Germans took greater pains to make abandoned LGs unusable; at one field near 'Marble Arch', 2000 mines had to be lifted by the RA/RE/RAF teams.

[27] 94th HAA Regiment took no part in the Sicilian or Italian campaigns: it remained in North Africa under Middle East Forces protecting the bases.