A "defensive wall" refers to a barrier or structure built to protect and defend against attacks or threats. It is typically constructed out of strong materials like stone or concrete to provide security. Full definition
By the time the big cruise - liner manages to turn around the entire defensive wall of the opposition is lined out to block our attack. (justarsenal.com)
The premise of the game is to enhance your resources, upgrade your town hall and build defensive walls to keep your enemies out. (goodereader.com)
In his drawings, similarly labor - intensive pencil strokes are tirelessly repeated to create structures resembling defensive walls. (artpace.org)