GWB-50 Thorneycroft Truck with Anti-Aircraft Gun
It was decided that the operation of these Anti Aircraft guns would be the responsibility of the Royal Garrison Artillery. Each Anti-Aircraft section comprised of two lorry mounted guns, one staff car and one motorcycle.
The sections were used to protect targets likely to be attacked by enemy aeroplanes such as ammunition dumps, observation balloons and railheads.
The gun trucks would find somewhere suitable to set up (a sunken road being an ideal location) and make themselves comfortable while waiting for the enemy to fly into range. Once an enemy plane was identified the gun would be brought into action. It was extremely difficult to identify the speed and height of a moving aeroplane, and then setting the appropriate fuse, was far from easy! It became a widely held belief that if enough rounds were fired into the air they would eventually hit something??
After having gone into action against an enemy plane, the anti aircraft section might become subject to German counter-battery fire, and it would therefore have to pack up and quickly move to a different location. This would leave any other units who were located nearby on the receiving end of the German?s wrath, so a newly arriving anti aircraft section was not always given a friendly greeting.