 In June, as the international situation worsened, a partial mobilisation of the TA was begun in a process known as 'couverture', whereby each AA unit did a month's tour of duty in rotation to man selected AA gun and searchlight positions.On 24 August the whole of AA Command was fully mobilised, ahead of the declaration of war.70th (3rd West Lancs) AA Rgt mobilised at Liverpool in 33rd (Western) Anti-Aircraft Brigade, also based at Liverpool.