page_title: 99th (London Welsh) Heavy Anti-Aircraft Regiment, Royal Artillery
section_title: Mobilisation
hierarchical_section_title: 99th (London Welsh) Heavy Anti-Aircraft Regiment, Royal Artillery / World War II / Mobilisation
caption_attribution_description: English: The British Army in the United Kingdom 1939-45 Range-finder devices at 303rd Battery, 99th Anti-Aircraft Regiment, Royal Artillery, Hayes Common in Kent, May 1940.
context_page_description: The 99th (London Welsh) Heavy Anti-Aircraft Regiment, Royal Artillery was an air defence unit of Britain's Territorial Army during World War II. It defended London during the early part of the war, and later served in the campaign in North West Europe.
context_section_description: In June 1939, as the international situation deteriorated, a partial mobilisation of Anti-Aircraft Command was begun in a process known as 'couverture', whereby each TA unit did a month's tour of duty in rotation to man selected AA positions. 99th (LW) AA Regiment was embodied under the command of Lieutenant-Colonel J.M. Davies, MC, at Iverna Gardens on 19 August and went to the AA Practice Camp at Aberporth in Wales. On 24 August, ahead of the declaration of war, AA Command was fully mobilised at its war stations. The regiment returned by train and established RHQ at 31 Mitcham Lane, Streatham, with 302 AA Bty taking over gunsite ZS17 at Mitcham, and 303 AA Bty at ZS15 (Norbury) and ZS13 (Shirley). The regiment formed part of 48 AA Brigade in 1 AA Division tasked with defending London.
caption: 303 AA Bty manning 3-inch guns and range-finders at Hayes Common, May 1940
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