Plural of Bren, a light machine gun widely used by British and Commonwealth forces during and after World War II.
From Brno (Czech city) and Enfield (English arsenal), abbreviated as 'Bren' to represent this collaborative weapon design. The plural is simply 'brens,' referring to multiple guns of this type.
The Bren gun was so reliable and deadly that it remained in military service for decades—soldiers nicknamed it the 'soldier's best friend,' and a single gunner with a Bren could hold off entire enemy squads.
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