On 26 September 1940, Tunna was at work at Morpeth Dock, Birkenhead when an air raid commenced. Ignoring the bombing, Tunna continued his work, marshalling a goods train where the main freight being carried was high explosive bombs for use by the Royal Air Force. While making a final inspection of the train before it departed, he came across one wagon laden with 250 pounds (110 kg) bombs alight due to a number of incendiary bombs having landed upon it. Fetching a bucket of water in an attempt to extinguish the fire, he was joined by the engine crew of the train and while they fetched more water, Tunna removed the wagonsheet[1] hoping that this would also drag the incendiaries off the wagon. It did dislodge one but another fell into the wagon between some of the bombs. Tunna climbed into the wagon and prised the incendiary out, throwing it away from the wagon. He then joined the enginemen in pumping water over the wagon until they considered the bombs to have been cooled to a safe temperature.[2]
Tunna's bravery in preventing what would have been a large explosion was rewarded by the award of the George Cross.[3]
He was awarded the medal on 24 January 1941. The citation reads:-
The KING has been graciously pleased to award the GEORGE CROSS to:-
Norman Tunna, Shunter, Great Western Railway, Birkenhead.
Enemy action over Liverpool Port Area resulted in a number of serious fires involving railway and dock warehouse properties.
A large number of incendiary bombs fell on and about the goods station and sidings.
In the course of these events Shunter Tunna discovered two incendiary bombs burning in a sheeted open wagon, containing 250-lb bombs. With complete disregard for personal risk, Tunna removed the sheet, extinguished the incendiary bombs and removed them from the truck. The top layer of these heavy bombs was hot.
Tunna's action displayed courage in a very high degree and eliminated the risk of serious explosions, the result of which it would be difficult to measure.[3]
