Add armor or heavier guns through a modular design. (bluesnews.com)
«The general public is therefore advised not panic at the sound of the firing of heavy guns emanating from the National Cenotaph. (securitykingng.org)
The explosions appeared to come from the south; as they continued, «the reports seemed to approach much nearer, and sounded like heavy guns occasionally, with slighter reports between.» (scientificamerican.com)