this phrase is a quote from a welsh farmer who went to spain to fight with the international brigade on the side of the communists in the spanish civil war (1936-1939). during this war people from countries all over the world came to spain to fight against fascism. tHOSE who joined the battle against franco's armies were no professional soldiers but just people with ideals and a gun. so was this welsh farmer, who said: if i have a gun and can shoot rabbits, than i'll go to the spanish civil war to shoot fascists.you can read all about the spanish civil war in george orwell's report homage to catalonia and in lewis jones' 'we live'.