an artillery base, especially one set up quickly to support advancing troops or to forestall enemy advances.
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How to use firebase in a sentence
When we finally got back to our firebase it was late on the third night.A Man to Believe In: Eulogy for Marine Master Sergeant Aaron Torian | Elliot Ackerman | March 5, 2014 | THE DAILY BEAST
British Dictionary definitions for firebase
an artillery base supporting advancing troops
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012